I was watching a show using my tiVo and I paused it for a few minutes, when I resumed it was very choppy. Looked at the info and it showed 3000+ dropped frames. Nothing I could do would clear this up other than tuning away and tuning back in, loosing the buffer content. Have not seen this issue on my FS4K.
How much free space does the device have? It’s possible the buffer took up enough space to start causing performance problems for the OS (assuming the OS also uses the same storage for swapping, etc. )