Rewind/Fast-forward issues with Xfinity Stream app on LG TV

Within the last few weeks, I continue to have an annoying lag invoking functions on the “rewind/fast-forward” menu when the timeline is displayed at the bottom of the screen. (I have been using Xfinity Stream app onLG for several years.) It can take 2-3 seconds for the cursor/highlite to respond.

Further, recently, rewind and fast-forward always return to the point where I invoked them when I hit Play again, even though the timeline display shows them moving appropriately.  I work around this very unsatisfactorily by: Fast-forwarding past the point I want to stop, then Rewinding briefly back to the point I want to stop, then hitting Play. (Or, conversely, Rewinding to just before where I want to stop, then briefly Fast-forwarding up to the point I want to stop, then hitting Play.)