pause won't work during recording or when trying to preview

Windows 10 home audacity 3.1.3
While trying to preview a new song to record from a line cassette player which I have used for this before. In audacity I set pause then record to preview the song. This now cancels pause and begins to record, and I can’t get pause to work for either preview or just pause the recording. This always worked before today. Please anyone have a solution?
Thanks Luckyman

Perhaps you have selected Transport > Transport Options > Sound Activated Recording.

THATS IT!!! Thank you so much!!