Hello Steve, 
Do you notice any decrease in wifi performance when you see these 'failed to 
send h2c command' messages? 

I noticed in your dmesg file you also see 'firmware failed to leave lps
state' around the same time you see the h2c message - this led me to
this coversation (https://github.com/lwfinger/rtw88/issues/61). Does
this issue seem similar to yours? This may mean the issue is related to
power saving. If you feel like your issue is similar to this please
verify some behavior by following these steps from the thread:

Update: the message flood only happens when laptop charger is not connected.
1) I connected the charger. The "firmware failed to leave lps state" message 
stopped to appear, but "failed to send h2c command" message still continuously 
flooded my dmesg
2) I put laptop to sleep, then wake up. Message flood stopped.
3) I disconnected the charger, and after few minutes message started to come in 
again.

Thanks -- Bethany

** Bug watch added: github.com/lwfinger/rtw88/issues #61
   https://github.com/lwfinger/rtw88/issues/61

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https://bugs.launchpad.net/bugs/2077217

Title:
  rtw_8821ce: failed to send h2c command

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