This is the dreaded meter problem. There are probably lebenty-zillion posts regarding it, if you search with those terms.
There are solutions available, based on controlling your own system. These have do do with Flash versions, browser type, and background processes. They have very little to do with clearing cache and Flash memory, although that's the preferred advise offered by WGT.
The actual problem revolves around the fact that these personal systems are not real-time operating systems. The ability of WGT to overcome those limitations is marginal and is REALLY marginal if one doesn't have the very best of programmers with intimate knowledge of operating systems. It is worsened because Flash is a 3rd party solution that more or less restricts one to the capabilities offered by the API.
Really good software guys have never considered Flash to be anything other than a potential problem. I wouldn't even allow it on my system for over 10 years.