Thanks nduli. Yes, HH5 stable blue after 5 mins... only got the 6 due do its advertised greater range. Not sure I have the stomach to keep trying new ones until and unless my chances of success improve (your 8th!!!) Thanks for advice on using chat.
THis is exactly my experience... it hangs on green then flashes purple. As I think it's completely dead it will maliciously go blue and start working just long enough to make me think it's OK before going wrong again.
When it's green/purple I can't access the control page or anything. I assume this IS the class green light of death type behaviour?