If you do a forum search, you'll find many, many threads discussing this. It most likely is due to the cache being full ime and needing to reload because of that. You can get a cache cleaner from the market which may help.
Howdy neighbor! Welcome to the best Evo forum on the planet! We have a lot of information available, so take your time, look around and get your bearings.
The first place you should start is the Basic Info for New Forum Members
thread. In there, you will find posting guidelines and links to essential information, FAQs, how-tos, answers to common issues, a list of apps and a list of accessories. We highly recommend reading everything there. If you do, I guarantee you will learn a great deal about your Evo!
If you have a question or problem that wasn't answered in the above thread, we ask that all members please use the search box
located at the top of every page first before
starting a new thread. If you are directed to a thread, please read the entire thread
If you have searched thoroughly and still have not found the answer you seek, feel free to post a message in the appropriate section. Please give as much detail about your problem as possible, including whether or not you are using a task killer (you shouldn't be), whether or not your phone is rooted
, etc. If you are having a problem with an app, please tell us which
app you are using. We'll do our best to help you but the more information you can give us, the faster/better we can help.
We understand that if you are having a problem or are looking for information, its difficult to wait for a response. However, please be patient as everyone here, including the staff members, have real lives and it may take some time to respond to you. Please do not bump your posts or post multiple times about the same thing. If someone can answer you, they will.
Well, that should get you started.
So welcome, have fun and happy Evo-ing!