iirc munk gives a free trial of 2 weeks or so when you first set up. if you have never donated via that portal then its likely its your free trial expiring.
munk is also really cool about it if you just contact him. when we first set up munkbot way back when, my steward accidentally donated to tampermonkey instead of munk and munk extended our 2 week trial for another 2 weeks anyway when I talked to him about it. im sure you can sort this out.
edit:
also... paying customer for more than a year? i thought you/Spartans don't use bots :P