Same issue. And seriously, no solutions? I've been using Field Maps since it came out and have never seen this issue before. I'm going to try to see if creating an offline map area and using that instead will help.
Was going to attempt the Collector "solution", but I've removed it from my phone. However, I've got a Samsung and my field tech having the issue is using an iPhone. I wonder if this is an Apple-related problem since most questions seem to mention Apple products?