Power accuracy drifting?

[florencepugh]

Hey everyone,
I've been using my smart trainer for a few months now and recently started noticing slight inconsistencies in power readings during longer rides.
At the beginning, everything feels accurate, but after ~40–60 minutesFootball Bros IO , the numbers seem to drift a bit higher than expected.
I’ve tried basic calibration and warming up beforehand, but not sure if I’m missing something.
Is this normal wear/temperature-related, or could it be a calibration issue?

I'm curious to hear if others have experienced the same and how you fixed it! Thanks so much!