Purchased E20 Roborock Vacuum in July. Worked great, app set up, wifi connected. For about 1 month, it gets stuck vacuuming the same strip of carpet over and over, almost likes it's glitching. I've recharged, turned off/on, reset wifi, reset facotry settings, cleaned....still does it. And after resetting to factory, it now no longer detects carpet or connects to wifi over 2G. Anyone offer help?