apple watch ultra screen glitch

I have had my Apple Watch for 1 week and loving it. I upgraded to iOS 9.1 and then again 9.2 when it came out. Using the watch everyday, not charging battery to above 80%, haven’t used in water or rain and it’s not had any bumps of any description. Today I took it off to charge and decided to switch it off and the following happened: the first glitch was 3 red lines across the screen and when I went to switch it back on it took over 1 min to switch on. The second glitch was a full screen flash at switching off and again over 1 min to switch back on. I successfully turned it off and on again with no issues, between the 1st and 2nd glitches. What is up with this?