Hello,
I don't know if it is the same situation. Although it didn't occour many times, we had masts that started sending a lot of partial files concerning the same day. In the wort cases we had one file every 10 minutes or without data.
My advice is that you should replace the logger with a spare one as this is a situation that, usually, re-starts to occour after some time even if you performed a data logger reset. You can perform further tests at the office or send it later to NRG for checking. I think this is the best solution if you don't want to lose any raw data.
Best regards,