SIDE NOTE: If you are still having issues with the aircraft files, we can take a look at the device log (from your RC). This may or may not tell us anything other than signal loss, however it is much easier to do. I will emphasize that the aircraft files are really the ones that are needed here, however, if there is anything in the device logs that would look "unusual" it could be a starting point. I have provided a link below for uploading the device logs. Read the page first and the P4P+ detailed instructions are near the bottom of the page. All you will need to to is upload the file to the link below and place a link back here to that. Granted, it may not give enough information, but it is a bit easier to do.
Log Viewer
Log Viewer