Hello,
a bug search using the information you have posted did not reveal any bugs that would apply to your situation. I wonder if your problem could simply be related to some sort of power outage, especially since it happens at apparently almost the same interval. Or maybe there is a very heavy traffic load, or some other, possibly user-invoked, process happening at that time. If possible, can you set up syslogging and log to an external device ? The problem is that the router logs are cleared when the router is reboot, so all the potentially relevant information is lost...
Regards,
GP
