Tosiba RDXV59DT rejects VCR Cassette when inseted?

I have had the unit for a couple of years, now when I try to use the VCR the cassette is ejected a few seconds after I have inserted it.
It starts to wind the tape into positon seems tight and in place then when its got to its correct positioning it just unloads every time. i have tried different tapes etc the take up arms seem ok.