krypton causing tv input problems

I decided to upgrade my fire tv gen 1 box to krypton and it began losing tv input for a few seconds every time I switch from kodi to fire home or vise versa. Also made a loud popping noise. It happened on both tv’s and on different hdmi cable. I even factory reset it. That did not fix it. Finally, reinstalled kodi jarvis and all is good again. Any idea what the problem was?