There are older, more vintage turntables equipped with tonearms that will, if left without resetting, not playback as desired. A turntable equipped like so will require a reset at the end of each record. Simply take the tonearm and push it to the right, to the edge of the record ring, past its usual resting place. There you should hear a clear clicking sound, signifying that the tonearm has indeed been reset. If this was indeed the issue and the tonearm simply needed resetting, then the turntable should be working perfectly fine now and you should have no further worries.