subduct
17
I had this situation last year, and the cause for me was having too much GAS-acquired gear on the table. I cut this down to 3 boxes with the rest packed away or sold, and now I can make progress every time I sit down.
I try to finish each session with picking (or even starting and leaving unfinished) a definite next task to start the next session with.
I still have a separate issue with laziness/motivation though 