Turn on syslog and it will probably tell you that you are running out of translations. Next time it happens try a "clear xlate" instead of a reload and if that fixes it then that's your issue. Syslog messages will tell you exactly the cause of the problem though.
If you are running out of translation slots then you hve to add another global command as such:
global (outside) 1 AA.BB.CC.21
As for why this has started happening "some days after the change", I would say it is more to do with an increased amount of traffic on your inside network, rather than you making this config change (whih shouldn't affect anything). The timing of it was merely coincidental.
Login to the FXOS chassis manager.
Direct your browser to https://hostname/, and log-in using the user-name and password.
Go to Help > About and check the current version:
Check the current version availa...
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...