Hey @ccnftubadave, I had something similar happen to me recently, where my garmin watch decided to reboot mid-run. It did save the first bit, but then when it came back to life, I had to start a new run. I didn't want to have 2 separate activities - so I used an online tool [GOTOES utilities for Strava] that was able to merge the two files together (the tile on the site that says 'combine/repair').
You'll need to get the FIT/GPX/TCX file(s) in order to merge them (if you have already synchronized with Strava, you can download the two files from Strava to then upload+merge on the GOTOES site. Once you upload them and merge, you will get a single (merged) file that you can then upload back to Strava. (you'll likely have to delete the two activities from Strava before you re-upload though, it will see as duplicate otherwise - so keep the two original files saved just in case).