We are experiencing APs crash each day and it is random below is what I am getting form the crash log:
spamApTask4: Mar 13 23:46:47.061: %CAPWAP-3-ECHO_ERR: capwap_ac_sm.c:7546 Did not receive heartbeat reply; AP: a0:e0:af:99:ef:a0
AP Model: AIR-AP3802I-B-K9
WLC Module: AIR-CT5508-K9
Software version: 22.214.171.124
It sounds like it is having trouble communicating with the WLC. Is the WLC nearby, or on the end of a WAN link?
I see 126.96.36.199 has also come out. You could try upgrading to that.
The release notes do mention this resolved bug:
Memory leak found @mm_heartbeat module on guest anchor WLC
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