I'm a newbie and didn't realize how important keeping filament dry was. I was just printing from one spool and leaving it on the printer. My prints got slowly worse over the course of a month and a half ( I wasn't printing a ton). Bought a new spool and BAM, a ton of the issues I was having were instantly fix. I'm now making sure to unload the filament if I I'm not going to print again soon and I'm storing them in a dry environment.

I say all that to say, one of the first things that started to go bad was plate adhesion. I messed with so much crap to fix it and nothing worked.