BSOD due to upgrade SEP 12.1.5337.5000?

We'ver recently upgraded to SEP 12.1.5337.5000.

Since this upgrade we're sometimes having BSOD.

HP did analyze the diagnostic reports. They say there are no hardware problems.

They indicated that the problem may be caused by software modifications that had been made day before first BSOD:

- 3 Windows updates

- SEP upgrade

Windows updates have been uninstalled. But we're still having BSOD.

So we've to focus on SEP.

I prefer not to uninstall SEP and let the server run for several days without protection.

Can someone help me where to look for a possible cause?

Any help is appreciated.

Best regards

Tom