I have been pretty consistent with my riding this year since April. I finished 3 weeks of a custom plan and then took a rest week at the end of October. Within a few days if being off the bike, my right quad started getting very crampy - nothing painful, but almost like it was beginning to seize up or I was losing control of the contraction. This happened with walking or mostly while going down the stairs. Going up the stairs didn’t cause any trouble, nor did jumping on the trainer and just spinning the legs.
I google and found a similar thread:
Anyone here have any insight or similar experiences?