iOS 12.1.2 iPhone 7+ keeps dropping WiFi
Recently, my iPhone 7+ running 12.1.2 keeps getting bumped off the Wi-Fi when I close the phone. When I pick the phone up to use it, it shows LTE rather than the Wifi symbol and I have to go into settings and reselect the network in order to get back on Wifi. I have not had this problem before and have been using this phone for over a year. No other changes in the house or the phone other than recent updates. This happens at home and at work where wifi is my normal connection method. No other wireless devices on the network at home nor the office are dropping due to network issues and I haven't found anyone else having this issue but most don't have iPhone 7s...
Please do not recommend If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network - Apple Support as it is not helpful and does not address my issue.
Thanks in advance.
iPhone 7 Plus