@aag
I had the same problems at the beginning with my UM 3 Extended. The humidity in my office during autumn, when you try to get some fresh air was killing my PVA. You should make yourself a storage box or buy the Polybox from Polymaker (no advertisement guys). This one is not really cheap but it has solved my problem very good. You could even keep the PVA inside the box during your print job, the filament runs through a tube to the feeder.
This has solved a lot of problems for me. You could also store the TPU or any other filament there which is prone to moisture.
Br
Thorsten