How to keep Transport controls working in Ableton?

Hi,

S49 MK2 - had it for years, love it when it works - but have an ongoing issue.

every 3 - 6 months, the transport controls in Ableton just stop working. in the past, restarting the keyboard and/or Ableton has fixed it, but as of today, that's no longer doing it.

latest KK, latest Ableton, latest firmware, latest Windows 10.

like i said, transport controls just stop working. the tempo and metronome buttons don't light up either. i can still pull up presets and play them while it's happening. this has happened every few months the entire time I've owned this thing, really looking to find a permanent solution to it.