Introduction
T-LCM getting stuck at 100% or 50% input at random is a sign of an Electro-Static Discharge (ESD) Affecting your pedal set. This Guide will help addressing the issue.
To learn more about ESD read this WIKI article, this news link and check out this discussion thread.
Parts
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Create a path from your rig or pedals to Earth, so that static electricity would dissipate through it.
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Conclusion
Eliminating possibility of Electro-Static Discharge will prevent your pedal getting randomly stuck at 100% or 50% input.