Possible Glitch [Seekbar/Replay]

Hello there,

I have had a few glitches lately on a few of my courses. It doesn't happen all the time but enough to raise an eyebrow.  My courses have the seekbar set for view only so they can't fast forward through the slide to speed up the process.  But if they happen to hit the replay button, it locks the slide and won't replay and it won't allow them to continue past. They can go to the previous slides, but if they return to this slide it will not replay and the next button is disabled.  I have done it numerous times and it the same result.  So, in the meantime, I turned off the seekbar.  Anyone else see this problem?  Solution?  The course is also published as LMS.

Thanks in advance