RT-AC5300 Router Conneciton Issues

Hi got a question regarding my RT-AC5300 where I keep losing network connection to all devices. When I look at the router physically it looks like its been rebooted. Ive gone into the system logs and noticed that it does state that its rebooting. Sometimes my connection time could be minutes to hours and is intermittent. Has anyone seen this?

Also got a few questions regarding the power supply....

Ive looked online and noticed that the power supply for the AC-5300 is supposed to be:

AC...

RT-AC5300 Router Conneciton Issues