Hi idonald1234
Welcome to the Forum!
It sounds like you may be on the cusp of 3G and 3G+ signal which would explain why this is happening.
If you select manage devices, then highlight the device and select edit. Choose the network tab you can set this to GPRS only. This would connect to only GPRS.
Unfortunately you can't re initiate the connection.
Have you tried using the booster cable that came supplied with your Modem? Sometimes this can provide a much more stable connection, this maybe to do with the shielding on your laptop.
All the best
BenJ_Vodafone
Eforum Team