Ejecting of tapes

this sounds like the sensor that when you put a tape in then it places it over the sensor saying tape in then takes tape in ready for play and band maybe streached if machine is over 1 year old open case and load tape in and see whats going on if the tape is getting through the guide loading to drumhead and look to see if drum is turning if it is and guides come out to drum then it ejects tape have a look to see if any object is jaming the pinch wheel if pinch wheel is clear then when tape is removed from loading bay use a cotton bud to clean the pinch wheel from dirt as this is the take up side and spindle then try tape again if same resaults clean the sensor where tape sits if same again screw lid down and take for repair
but if in 1 yrs warranty take straight for repair.

good luck