I guess it is due to lower transaction fee, I just noticed that any transaction less than 200s.byte will be possibly confirmed on the next 25 blocks, mostly the one that is instantly confirmed are the one that sent a transaction of 400+ sat/ byte. There is a sudden increase in transaction fee and this time it is actually insane.
Currently, most of my fee is 400/byte and I still need to wait more than 1 day for my transaction to be confirmed. Your fee is only 160 satoshi/byte. well, I think it will stuck there for whole week
Thank you guys, I guess its cause of the bitcoin price rising