sounds like maybe the heater cartridge might be on the way out.
Do the temperatures look okey when it's jamming ?

Ah - looking at your picture, the filament is not feeding into the hotend. It's gone off to the left hand side.

Usually you only get that with flexible filaments.

Maybe something stuck in the feed hole.

Me, I'd strip the extruder down and make sure there wasn't a blockage anywhere.
Having done it recently - it's pretty simple.