It sounds like your cassette deck's ***auto-reverse mechanism*** isn't functioning properly. This issue is often caused by ***worn-out belts, misaligned gears, or dried lubrication*** in the mechanism. Here are a few troubleshooting steps you can try:
# ***Check the Belts*** – Over time, belts can wear out or slip, preventing the deck from properly switching sides. If possible, inspect and replace them.
# ***Clean and Lubricate Moving Parts*** – Dust and dried grease can cause mechanical failures. Carefully clean and lubricate the auto-reverse mechanism.
# ***Inspect the Head Rotation Mechanism*** – Some decks use a rotating head for auto-reverse. If it's misaligned or stuck, it may need adjustment.
# ***Reset the Deck*** – Try unplugging the unit for a few minutes and then powering it back on to see if it resets the mechanism.
# ***Seek Professional Repair*** – If the issue persists, a technician may need to inspect the internal components.
You can find more details on similar issues [post|897607|here|new_window=true] and [link|https://www.tapeheads.net/threads/sony-tc-wr950-playback-and-auto-reverse-issues-new-here.85611/|here|new_window=true]. Let me know if you need help with any of these steps!