I am having a very similar problem see examples below:
Original File 1 - 2,870KB 133kbs bitrate 0:02:56 Duration converted with Switch became
Switch. File 1 - 4,282KB 112kbs bitrate 0:05:15 Duration (the extra duration becoming 0:02:19 of silence at the end of the song
Original File 2 - 3,960KB 145kbs bitrate 0:03:43 Duration converted with Switch became
Switch. File 2 - 5,909KB 112kbs bitrate 0:07:18 Duration (the extra duration becoming 0:03:35 of silence at the end of the song
Original File 3 - 4,580KB 143kbs bitrate 0:04:21 Duration converted with Switch became
Switch. File 3 - 6,827KB 112kbs bitrate 0:08:24 Duration (the extra duration becoming 0:04:03 of silence at the end of the song
Have several similar examples which are available if anyone wishes to test this result
Will now have to check all results for similar problems.
Up until recently Switch was performing well.
Wonder now if it is worth upgrading to the plus version.