I had a similar experience. I tried to load MS 17.1.3 on a number of older MS120, MS220 and MS320 switches, and yes, I know the MS220 and MS320 switches aren't technically supported. After the upgrade, Cisco phones would not register to the Webex cloud and the overall network performance was very poor. I reloaded MS 16.9 on all of the switches and they all started working normally again. I am going to wait for a while and let the programmers iron out some more bugs before I try the MS 17.x code train again.
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