This issue is driving me crazy. In my case, filament won’t load. It complains about a stuck spool.
I’ve confirmed it’s not the hotend (I have three, .2, .4, and .6 - and both the .4 and .6 behave the same. I can extrude manually as much as I want, but when I do a load or start a print it fails. I’ve tried it with the ams lite (o an a1) and external spool.
I’ve verified the filament path is clear. I can manually push filament through the extruder with the ot end off.
I’ve done old pulls. Switched hotends. It’s a paperweight. Before tonight, it printed fine. I got it on friday and have printed the top mount and a few other pieces. No issues, and then wham.
Creality never gave me this much trouble. The firmware thinks there is a problem and shuts down.
So much for it just works.
Ok, so I completely disassembled the extruder to check for anything broken/jammed/dirty, but found everything looking new and normal. The gears meshed, bearings turned smoothly, filament path was clear and I could put filament down through it normally.
Reassembled it, and although it was creating poop on extrude, it would fail on load or printing with an error of a jammed spool. The spool isn’t jamned - I can spin the spools easily.
I’ve tried it with and without ams lite. I’ve tried multiple nozzles. I’ve tried about 5 different filaments.
It is failing 100% of the time now.
I’m going to take a break, but I should be printing.
Ho do I open a ticket ith bambu anyway?
And… I may have an answer/workaround.
I found it on another thread, but basically I went into settings > ams and turned everything off, then went into settings > printing and there turned off the filament settings.
It worked. No other changes. No nozzle or filament changes.
In my case at least, it must be a firmware glitch that is over detecting
On on my thirrd print, and no issues other than the ptfe tubes getting hung up on the top mounted ams - my error.
Not pleased at the lost of functions but I’m happy I don’t have a $500 paperweight.
But my creality machines are running well also, so not sure what the big deal is except multicolor and speed. 
I’m having the same problem and it seems to be only happening with a specific filament. Can you point me out to this post?