Losing session user_data randomly

[eluser]ray023[/eluser]
[quote author="suicidalandroid" date="1286527399"]
...Any ideas?[/quote]

I have an idea because I've been chasing a similar problem the past couple of days.

Are you setting session values to the use the database:

Code:

$config['sess_use_database']    = TRUE;

If so, the value in your user_data field might be going over the field's limit; which will cause CI to destroy the session var (See Saving Session Data to a Database)

UPDATE: Now that I've taken a closer look at my database, I noticed that I had user_data set to varchar(255) instead of TEXT

You probably have paid a bit more attention to detail than I have for your issue...but I will leave this post in tact on the chance it proves helpful.