Yes you are going to get your answer but you are talking to a human being (not a computer) who goes to sleep early sometimes and you replied at 11 PM some 12 hours after my last reply .
Now about your vcr
Although tapes can degrade over time or be affected by magnetism for example , the most common cause for what you described is the vcr itself.
Somewhat like a tape deck the audio heads do need to be cleaned once in a while and a video head cleaning tape will not do the trick.
In any case beside clogged/dirty heads , this can be caused by misaligned tape path , improperly adjusted tape back tension etc.
While a repair shop with an older tech. (like me) may be able to look into this , it may be cheaper and more effective to buy a DVD/VCR combo unit , i don`t think you can find a new VCR alone , they come in combo now
Here are a few examples ;
Or this one ;
If that answers your question please do not forget to rate by clicking on the 5-star icon at the top, then click on Submit so i get paid for my time helping you or you can use the reply button before or after rating if you have other questions , thank you .