Sangoma CPA crash and stable Windows version

[okli]

We are evaluating Sangoma CPA and it's been running great for 3 weeks without a single issue.
It's version 2.0.6 on Quad Core Xeon, 8 GB RAM and Windows 2003 x64.

Suddenly, in the past two days it's crashing regularly, yesterday twice, and today twice so I was forced to turn it off. Server was rebooted after each crash before starting it again and call volume is similar.
Nothing has been changed on the Windows server, nor anywhere else around the system. Logging in CPA was set to cpa-stats file only, so there are no large log files accumulated.

I have an open ticket with Sangoma, but would love another opinion.

Has anyone experienced such crashes? What CPA version for Windows is proven stable?