You are going to want to clean the heads in your DV deck often. Those old tapes are shedding, and DV is very intolerant to drop outs. Get some Texwipes and head cleaner and blow the dust out of that VTR. Clean after each tape and let it dry before inserting a new tape.
Also, DV uses an obsolete compression codec no longer supported, so convert those captured movs to ProRes 422HQ if you want to have any hope of using them in the future. Use Topaz Video Enhance AI to convert the interlaced footage to something useable in today’s progressive world.