This is more than likely related to a memory leak. What version of ASA code are you currently running? You may want to disable WebVPN caching as a first step and then monitor the memory utilization on the appliance. If the issue persists, we will need to enable some memory tracking features in order to isolate further.
R1-ASA5505-01# conf t R1-ASA5505-01(config)# webvpn R1-ASA5505-01(config-webvpn)# cache R1-ASA5505-01(config-webvpn-cache)# disable
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...