for the last 7 days I have had the same problem. after 6 months of great battery life, this just started happening!

I am also at the latest OS.

I have tried changing the connections to never search for a new connection, turned off all auto updates of email, rss, etc.

today I added an alarm to the clock and later deleted it. (maybe it is the ghost alarm issue?)

tomorrow I will know if it is fixed!