It died overnight Sat/Sun. marts had it rebooted Sunday lunchtime, and within an hour it went tits up again and we were down overnight then. But he's done some fettling on it this morning and found a few issues.
Just let us know if an Error 500 appears again, or anything else as we may not be aware of it.
He's still working on it, so it maybe up and down today while he tinkers.