I found and fixed a few issues for Foscam cameras and created a build for ppl to test whilst the changes are reviewed and merged.
That thread should contain info on the alarm not always working. You dont need to use the binding to enable/disable you can do it either way.
Anything is possible as there are so many different combinations to use this binding in it is impossible to test all of them when I don’t own all cameras on the market, having said that I would be very surprised if it was when your not using the image channel. The best thing to do is to uninstall the binding and see if the memory stops increasing, if it does then you know the binding is the cause and we can fault find further, but lets not guess until we know for sure which binding is the cause on your system.