here is also described: from developer of MAGDLR cottula
..."After flashing you MUST do clear storage option, otherwise ROM may not boot"
AND I know from all other custom ROM´s (android, wm6.5, wp7)- it´s recommanded to clear/reset the memory after ROM flash to prevent issue from fragmented memory ...
- my omnia7, no matter which ROM, Stock or custom, my mi7ROM or one of cessheim ROM- never problems with self rebooting or overheating ...
This was also true in old days WM6.5 where my P3600 and then the P3650 ( Polaris ) needed a stock rom re-flash and then the custom rom flash, completed by a clear storage just after flash of the custom rom to get correct function. Also true on Blackstone