Since the weekend my p30 connection to the home WiFi has been really slow. It also slows down other devices on the network like my xbox one. Ive tried wiping the cache partition, restarting the phone/router and resetting the network settings. At times it works fine for a minute when connected at first. On the WiFi settings the link speed drops from 144mbps to 5mbps after about 1 minute. Anyone got any suggestions to fix this?