S3148-ON Switch Power Cycled Stuck at U-Boot Prompt

We have two switches in a stack that, after a power cycle got stuck in the boot up process with all port LED lights on and sitting at the U-Boot prompt.  We could not get out of this prompt and we called support.  Support said they could not recover and shipped out two new switches.  We will be replacing them soon but I wanted to know if these model switches had the same Atom CPU issues as the S3048-ON or if these are plagued with the flash memory write issues?  It is weird that both got stuck at the same time unless one of the two above are true that would make sense.

We also have a N3224F-ON switch that has been powered up for as long as these stack switches have been as well.  Would these be affected with any of the above issues?

We, also have another stack of S3148-ON switches in another location but they have multiple redundant power options so they have not been power cycled yet.  

Any info is appreciated.