If you are having problems with some plugins not communicating correctly or causing memory leaks, please upgrade to firmware 1.5.236. It was released yesterday and fixed a floating point bug. Apparently, this bug also messed up the way that luup tracks device information and specifically the lul_device input to startup functions.
To upgrade, you must go to http://cp.mios.com.
How do I upgrade to UI5? Using Vera2
You would need to go to MiOS. However, a word of caution. UI5 is still beta and there are issues that are still being resolved. If you feel like you want to try out UI5, than please go to the link.
Are there release notes for this version? I’m curious if the issues with the HSM100 3-in-1 and the Horstmann thermostat are being addressed. I’d love to switch to UI5 and finally have a use for my Minimotes, but issues with the aforementioned devices keep me on version 4. 
No release notes that I know of for every build. The 3 in 1 from my experience still has issues. MCV provided a new build for the beta testers. I have not had the change to load it up and see what has been fixed. We have asked MCV what was fixed in that build.