Any solutions please?
There is only one - Go to Edit > Audio Hardware Setup and remove the check in the box that says "Release ASIO Driver in Background".
The problem is that the ASIO driver can't be shared (this is an ASIO limitation, not an Audition one) - and if it's released when Windows focus shifts then everything, including recording, will stop. So what you
can't do is switch to another app that wants to use your ASIO driver and have it work at the same time as Audition.