HD Set Top Box Can't Change Channels

[fishingeddie]

Recently - my HD Set Top Box locks where I can't change channels. It powers up shows picture of the last channel, but then I cannot change channels or bring up the menus. Remote seems fine. It happened once about a month ago, but now it has occured 5 times in a week. I solve the problem by resetting the HD box but this is getting annoying. Is this  a sign that the box is going bad?

[CRobGauth]

Probably.

Just to make sure, you don't have airflow blocked for box?

That can cause overheating.