Experiencing issues with Maxthon 3.3.9

I only use Maxthon 3.3.9 as my web browser. But recently I experience some problems on my browser.
When I use my mailing software, the browser become hang. And then I notice that it is using my 60% of the CPU. I forced to kill this process. I only suspect problems with my new 3.3.9 beta version, not the old version (3.3.8)
Do anyone know how to solve this. It will be a great help.
