AC 3100 set up as a AP starts of fast but needs to be rebooted daily?

Hi, I have a RT 5300 in the house hooked up to Nano stations,One is hooked to my primary router and one is hooked up in my shop to a AC 3100 . I get very good speeds out there if I reboot the AC3100 AP Router before I use it. It will slow down to almost nothing after a little bit of use. Any ideas?