Good day to you @Bob1954,
Sorry to hear about the issue that you are facing. Looking at it that there are a few reasons which could include power saving feature on the device or unstable network connections.
I would say to try and see if the Bitdefender VPN has been excluded from the battery optimization or power saving mode as the device could be putting the application to sleep/not run in the background to conserve battery life.
I have also found this and hopes it does help you out with the issue that you are facing at the moment with the given link below:
https://www.bitdefender.com/consumer/support/answer/2099/
If the issue does still continue, I would advice you to get to the bitdefender support team at this link to get in touch with the Support teams for assistance:
https://www.bitdefender.com/consumer/support/help/
State your contact reason / choose request category, then choose from the available contact channels, chat, phone and email/ticket. Chat would be the fastest way to reach them.
Kindly note: Bitdefender telephone support is not toll-free
I look forward to your warm update
Best Regards,
Flanksy✌️
