Thank you for getting back to us.
Can you please make sure that if you are using extensionless pages for example you have set the website to run all managed modules on all requests (web.conig):
You should also contact your hosting provider to find about your application pool's memory limit.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items