What is the most common cause of a grabbing clutch? on 1993 Mazda B2200

Issue occurs in 1st and 2nd gear, where the grabbing or stuttering action happens upon releasing clutch. Have had slave cylinder replaced approximately 2 years ago; cracked manifold replaced 1 year ago. 135,000 mi. 2.2L, not FI. Clutch fluid level checked 1/mo., full.

Asked by for the 1993 Mazda B2200
Also a defective pressure plate could cause this but clutch removal/inspection is required for either Roy's suggestion or mine.
Thanks...appreciate you guys!
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hot spots on the flywheel. it needs to be re surfaced or replaced.

Thanks...appreciate it.