Cannot find any AMD adapters and no longer connecting to pool

this is part of my log. below: from Claymore cryptonote gpu miner (does the same across 9.7 10 and 11)

anyway been mining for a month no problems what so ever with 3 rigs. then yesterday one by one they are have the same issue?

and occationally Cannot find any AMD adapters and then fail to connect.

watchdog - thread 0, hb time 47
13:29:27:369   2438   watchdog - thread 1, hb time 47
13:29:37:229   2370   Cannot resolve 'xmr-eu2.nanopool.org'
13:29:37:229   2370   Stratum - Cannot connect to xmr-eu2.nanopool.org port 14433
13:29:37:245   2370    Stratum - Failed to connect, retry in 20 sec...

So I've done a clean sweap on two machines problems still there? nothing has changed, internet router has been reset to factory and re setup?

Any help would be useful.

edit to add eu1 and eu2 both fail.

currently able to mine on xmr-us-east1 but no others?

Sorted. Random DNS error from router sent to all machines