Frequent shutdowns on start after update to 5.80 :/

After updating to 5.80 my gpsmap 66i shuts down during start (at the "loading maps" screen). The device starts in 1 out of 3 starts. This is quite bad, this device crashes more than it works. Garmin this wasn't a cheap device, and its also not a leisure device, this is supposed to be reliable in the most adverse conditions when your life may depend on it. These crashes are unacceptable. I am not even mentioning the almost unusable search function, or very slow map rendering. Gpsmap 64 is quite solid compared to the 66...

Please fix these issues soon, 

Thanks!
C