On workbook open a module (calculate) is called, at the end of that module a Runtimer of 3mins calls to repeat the same module.
I have 2 issues
1- If the workbook is closed but excel still open or i open a different workbook after 3 mins it reopens the previous workbook... Presuming that a Runtimer is executing somewhere in the background still.
2 - If the first workbook is opened and i open another workbook after the 3 mins a runtime error occurs.
Hopefully i have provided enough info that makes sense, feel free to ask additional questions I'll respond asap.