For the past couple of months, 4G has periodically dropped connection, either completely or to < 0.1 Mbps. This is frequent, occurring multiple times per day or in a single session, making mobile data unusable.
Prior to this year, connection was never an issue. Use of 4G on different networks abroad has been completely without issue. The SIM has been tested in a different phone and shows the same pattern.
The coverage checker shows good signal in the area, and again didn't have an issue until this year.
Is there any potential fix or should I change network?