Strange CPU consumption

Hello Guys,

I have made a Windows Service in VB.NET years ago and it is running
great on more than 20 machines today. However, it always takes ca 30%
of the CPU (even at times when it shouldn't do anything) on one
problematic computer. Is there any utility or any way of finding out
what the currently running .NET process is doing (which commands it is
currently executing)?

Thanks, Alex