It's not likely to be caused by inadequate tracking force, else you'd be mistracking any time you played a passage with heavy dynamics, regardless of location on the LP.
It could be just a simple antiskating misadjustment. I doubt it, but you should check. Start by setting A/S to zero, then apply the minimum needed for clean tracking.
Other possibilities:
Tonearm wire bent, twisted or hitting something?
Arm stub brushing a dust cover or other misplaced object?
Cueing support bar not lowering enough and armtube hitting it?
Optional anti-skate mechanism (if you have) hanging up?
Armtube not correctly seated in bearing?
Table not level?
It could be just a simple antiskating misadjustment. I doubt it, but you should check. Start by setting A/S to zero, then apply the minimum needed for clean tracking.
Other possibilities:
Tonearm wire bent, twisted or hitting something?
Arm stub brushing a dust cover or other misplaced object?
Cueing support bar not lowering enough and armtube hitting it?
Optional anti-skate mechanism (if you have) hanging up?
Armtube not correctly seated in bearing?
Table not level?