Right, you don't understand. I'll set the position out clearly and hopefully you will see there's a real issue with security here.
1. This server has been in operation for 2 years or so.
2. The password we used was secure...32 characters, upper/lowercase/numbers
3. The password has disappeared spontaneously several times. I've raised it with support and the response has been to look for malware on my PC and use incognito mode...as if either of those would make any difference
4. We have access to admin login secured to a few ip addresses. This disappeared too.
5. SIP trunk passwords were changed
6. Users web client passwords were corrupted.
7. We have a backup taken every day
8. SSH access is limited to a single ip address and authenticated by public key. Password login isn't permitted
This isn't the first time it's happened and the only explanation is an issue with your software. This is NOT a new installation.
As I have said twice, I seen this several times and raised it with support. The response has been disappointing. As you have not addressed the point at all we have no option other than to find an alternative to Vodia that works as described.