Just got my Unifi router replaced from L7 network old router to Dir-850l, the past few days my internet was so slow and keep disconnecting, called 100 and they reset the port also the same problem. The technician came this morning and replaced the router.

Everything seems to be ok now, no more DC, was told that since I upgraded from 10 mbps to 30 mbps, I was entitled to 1 year hardware warranty on my router thus entitled to be replaced with a new one, yeay!