Integration with iOs Files app dropping out

I'm using my iPad when this occurs. I honestly have not tried it on my iPhone because the reason I am opening these files in the Files app is for markup with the pencil.  My iOS version on the iPad is 15.2.1. This iPad does not have cellular capability, so it happens when I am connected to Wifi. I can force a fix by turning off Wifi for about 3-4 minutes, but I have no way of knowing if that is any faster than just waiting for it to fix itself in about that same amount of time. It interrupts my workflow and worst of all my rhythm when grading. Keeping that momentum going is critical for me to get it all done in the limited time we have to turn around grades and provide equitable feedback to each student. As a workaround, when the drop outs occur multiple times during a single grading session, I have moved all my files to a secondary cloud drive in a temporary folder. I finish my grading run from that cloud service without any interruption by lost connections, and then I move the files back into Dropbox to maintain a consistent location for all my student submissions. I do not like having my files in multiple places, even for a short period of time. The risk of forgetting where a set of files is located or ending up with multiple versions on different cloud services in different stages of completion is too great. I started with Dropbox before I added any other cloud storage services to my mix. The vast majority of my prep and grading records are there. It would be a huge project to completely switch all those files over to a different cloud service just because the connection keeps dropping out on the device I use to do my grading markup. I sincerely hope someone can help. If you need additional info, please let me know.

Barry