It may sound strange, but a lot of problems are generated by a dirty head.
I had similar problem and was searhing the internet for a service centre. One site recommended that a head cleaner was a cheap and useful first step as it claimed most generated errors are from dirty heads.
It also said that heads do not like it if you use more than one brand of tape as the all have different magnetinc compositions and this affects the head.
I purchased a Panosonic head cleaner for around £8 of the internet and that (to my surprise solved the problem)I can't remeber the site, but if I find a link I'll post it.
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