Well, its still early days. Running since 21:52 08/01 ... nothing happened yet.
Usually the first one fell over after 12 hours. I am running 1 stock and one "fixer upper" - Both still going good.
I didn't change anything else so that we can keep this experiment clean.
The one I cleaned seemed to fall over more frequently... so something has definitely changed but 24 is the record to break, then 48, then at least a week!