Bitcoin Core 15.1 stuck syncing headers

[crashtest22]

Hello all,
I have been searching for a day and cant seem to figure out why bitcoin core is stuck.
win 10 latest updates
was working fine 6 days ago
debug log attached
have checked ports and 8333 is set to open on firewall and asus router but port checker says blocked.


2017-12-27 18:15:29 Bitcoin version v0.15.1

2017-12-27 18:15:49 ProcessMessages(headers, 75009 bytes) FAILED peer=0
2017-12-27 18:15:51 receive version message: /Satoshi:0.15.1/: version 70015, blocks=501299, us=73.93.78.5:51556, peer=1
2017-12-27 18:15:51 ERROR: AcceptBlockHeader: block 0000000000000000006a69cc9058e643bbecff0d328b59553f2802d75d7ebe9b is marked invalid
2017-12-27 18:15:51 ERROR: invalid header received
2017-12-27 18:15:51 ProcessMessages(headers, 75009 bytes) FAILED peer=1
2017-12-27 18:15:52 receive version message: Armory:0.96.3.99: version 70012, blocks=-1, us=127.0.0.1:8333, peer=2
2017-12-27 18:15:55 Loading addresses from DNS seeds (could take a while)
2017-12-27 18:15:55 234 addresses found from DNS seeds
2017-12-27 18:15:55 dnsseed thread exit
2017-12-27 18:16:13 receive version message: /Satoshi:0.14.2/UASF-Segwit:1.0(BIP148)/: version 70015, blocks=501299, us=73.93.78.5:58345, peer=3
2017-12-27 18:16:14 ERROR: AcceptBlockHeader: block 0000000000000000006a69cc9058e643bbecff0d328b59553f2802d75d7ebe9b is marked invalid
2017-12-27 18:16:14 ERROR: invalid header received
2017-12-27 18:16:14 ProcessMessages(headers, 75009 bytes) FAILED peer=3
2017-12-27 18:16:20 receive version message: /Satoshi:0.15.1/: version 70015, blocks=501299, us=139.59.210.12:8333, peer=5
2017-12-27 18:16:21 ERROR: AcceptBlockHeader: block 0000000000000000006a69cc9058e643bbecff0d328b59553f2802d75d7ebe9b is marked invalid
2017-12-27 18:16:21 ERROR: invalid header received
2017-12-27 18:16:21 ProcessMessages(headers, 75009 bytes) FAILED peer=5
2017-12-27 18:16:21 receive version message: /Satoshi:0.13.1/: version 70014, blocks=501299, us=73.93.78.5:58369, peer=6
2017-12-27 18:16:22 receive version message: /Satoshi:0.15.0/: version 70015, blocks=501299, us=[2601:647:ca01:4708:aded:5d88:9938:3075]:58366, peer=4
2017-12-27 18:16:22 receive version message: /Satoshi:0.15.1/: version 70015, blocks=501299, us=73.93.78.5:58370, peer=7
2017-12-27 18:16:28 receive version message: /Satoshi:0.14.2/: version 70015, blocks=501299, us=73.93.78.5:58386, peer=8
2017-12-27 18:16:28 ERROR: AcceptBlockHeader: block 0000000000000000006a69cc9058e643bbecff0d328b59553f2802d75d7ebe9b is marked invalid
2017-12-27 18:16:28 ERROR: invalid header received
2017-12-27 18:16:28 ProcessMessages(headers, 75009 bytes) FAILED peer=4
2017-12-27 18:16:28 receive version message: /Satoshi:0.15.1/: version 70015, blocks=501299, us=73.93.78.5:58391, peer=9
2017-12-27 18:16:29 ERROR: AcceptBlockHeader: block 0000000000000000006a69cc9058e643bbecff0d328b59553f2802d75d7ebe9b is marked invalid
2017-12-27 18:16:29 ERROR: invalid header received
2017-12-27 18:16:29 ProcessMessages(headers, 75009 bytes) FAILED peer=7
2017-12-27 18:16:30 ERROR: AcceptBlockHeader: block 0000000000000000006a69cc9058e643bbecff0d328b59553f2802d75d7ebe9b is marked invalid
2017-12-27 18:16:30 ERROR: invalid header received
2017-12-27 18:16:30 ProcessMessages(headers, 75009 bytes) FAILED peer=8
2017-12-27 18:16:35 receive version message: /Satoshi:0.15.1/: version 70015, blocks=501299, us=73.93.78.5:58408, peer=10
2017-12-27 18:16:35 receive version message: /Satoshi:0.15.0/: version 70015, blocks=501299, us=73.93.78.5:58409, peer=11
2017-12-27 18:16:36 ERROR: AcceptBlockHeader: block 0000000000000000006a69cc9058e643bbecff0d328b59553f2802d75d7ebe9b is marked invalid
2017-12-27 18:16:36 ERROR: invalid header received
2017-12-27 18:16:36 ProcessMessages(headers, 75009 bytes) FAILED peer=10
2017-12-27 18:16:36 ERROR: AcceptBlockHeader: block 0000000000000000006a69cc9058e643bbecff0d328b59553f2802d75d7ebe9b is marked invalid
2017-12-27 18:16:36 ERROR: invalid header received
2017-12-27 18:16:36 ProcessMessages(headers, 75009 bytes) FAILED peer=11
2017-12-27 18:16:58 receive version message: /Satoshi:0.15.1/: version 70015, blocks=501299, us=73.93.78.5:58466, peer=12
2017-12-27 18:16:58 ERROR: AcceptBlockHeader: block 0000000000000000006a69cc9058e643bbecff0d328b59553f2802d75d7ebe9b is marked invalid
2017-12-27 18:16:58 ERROR: invalid header received
2017-12-27 18:16:58 ProcessMessages(headers, 75009 bytes) FAILED peer=12
2017-12-27 18:17:37 receive version message: /Satoshi:0.15.1/: version 70015, blocks=501299, us=[2a03:b0c0:3:d0::2400:f001]:8333, peer=13
2017-12-27 18:17:38 ERROR: AcceptBlockHeader: block 0000000000000000006a69cc9058e643bbecff0d328b59553f2802d75d7ebe9b is marked invalid
2017-12-27 18:17:38 ERROR: invalid header received
2017-12-27 18:17:38 ProcessMessages(headers, 75009 bytes) FAILED peer=13
2017-12-27 18:18:01 receive version message: /Satoshi:0.15.1/: version 70015, blocks=501299, us=73.93.78.5:58629, peer=14
2017-12-27 18:18:06 receive version message: /Satoshi:0.15.0.1/: version 70015, blocks=501299, us=[2601:647:ca01:4708:aded:5d88:9938:3075]:58641, peer=15
2017-12-27 18:18:07 receive version message: /Satoshi:0.15.1/: version 70015, blocks=501299, us=73.93.78.5:58644, peer=16
2017-12-27 18:18:13 receive version message: /Satoshi:0.15.0.1/: version 70015, blocks=501299, us=73.93.78.5:58661, peer=17
2017-12-27 18:18:25 receive version message: /Satoshi:0.15.1/: version 70015, blocks=501299, us=73.93.78.5:58696, peer=18
2017-12-27 18:18:47 receive version message: /Satoshi:0.15.1/: version 70015, blocks=501299, us=73.93.78.5:58746, peer=19
2017-12-27 18:18:59 receive version message: /Satoshi:0.15.0.1/: version 70015, blocks=501299, us=73.93.78.5:58771, peer=20
2017-12-27 18:19:05 receive version message: /Satoshi:0.15.1/: version 70015, blocks=501299, us=73.93.78.5:58789, peer=21
2017-12-27 18:19:06 receive version message: /Satoshi:0.15.0.1(UASF-SegWit-BIP148)/: version 70015, blocks=501299, us=73.93.78.5:58791, peer=22
2017-12-27 18:19:46 receive version message: /Satoshi:0.14.2/: version 70015, blocks=501299, us=73.93.78.5:58873, peer=23
2017-12-27 18:20:20 ProcessMessages(version, 113 bytes) FAILED peer=24
2017-12-27 18:22:53 receive version message: /Satoshi:0.15.1/: version 70015, blocks=501299, us=73.93.78.5:59308, peer=25

[crashtest22]

Decided to start a reindex via command prompt will report back after it's done. only 3 years to go lol

[crashtest22]

Not totally sure what fixed the problem but after reindex its up and running as full node again.