This router is plagued with issues, even after the latest firmware was pushed a few weeks ago. Review the 1st sticky and decide for yourself . I personally have a GT-AC5300 (main) and an RT-AC5300 (AIMesh node) and have few problems but others that use VPNs (especially) are having horrible issues. I only have the occasional wifi connection drop.
See issues list here:
Personally, I would suggest save a few $$$ & look into the newer Nighthawk series.