Read the 7.14 thread… http://forum.mikrotik.com/t/v7-14-3-stable-is-released/174007/1 or do forum search for like issue…
http://forum.mikrotik.com/t/too-many-wireguard-logs-from-version-7-14beta3/172509/1
Lots of problems with wg and logging etc…
/system/logging/set 0 topics=info,!wireguard action=memory