@David-TP 

Thanks for your reply. We'll try the chipset driver update and see if it makes a difference. On further inspection, it seems we have the memory leak on Win7 and Win10 machines but not on XP machines.

I think we have about a hundred of the devices but there are only about a dozen on the live estate (It's a reasonably recent acquisition for us). That said, it's not the device that's the problem it's the driver, which we have installed on far more machines in preparation for needing to support the 5GHz device. So our "problem" far outweights the number of physical devices we have purchased to date.

More later on this once we have tried the chipset drivers....

thanks again

Mat

  @David-TP 

Early indications suggest that the chipset drivers have made a dramatic improvement. They *may* even have fixed the issue. We will continue to monitor our test program but it's looking hopeful. Thanks very much for your help!

regards

Mat