I've noticed when I watch recordings/rewind/skip commercials the FireStick 4k gets slower in responding to the forward/back arrows.
It seems the ChannelsDVR apps cache is getting full - it runs 20-80mB when I look. Clearing it helps keep the it running fast.
But when does the apps cache get cleared?
Could it be cleared by ChannelsDVR when you switch to a new recording program choice?
I have manually cleared the ChannelsDVR cache using House/Gears/Apps/Manage/Clear Cache, but that's just too many buttons.