I have an 8.5 month old Bolt OTA with voice remote and 1TB (Western Digital Hard drive from the factory) that came up with the "serious problem ... wait 3 hours" message. I called support and they had me unplug everything and start the 3 hours again and it will not start up. I'm getting the blue light on the front panel and occasionally the yellow or orange blinking light next to it. It cycles through the "serious problem" message to the Tivo logo to the "starting up" message and loops every few minutes through this. From day one I have had it raised off the floor with risers, with the cable card door off and with a USB fan blowing (correctly) to keep the unit cool and have never even felt the case get very warm with this setup so I don't think I have a temperature problem Support wants $50 to exchange the unit, no warranty. The Toshiba MQ03ABB200 2TB 2.5" x 15mm drive can also be purchased for about $50 on Amazon. Either way I'll be down a few days with shipping and will lose all of my saved programs (bummer but not the EOW). More space is nice but not necessary. Would I be better off switching the drive out? I've read lots of threads on the drive and some are having good results with the drive swap. Any current advice appreciated. I'll keep the thread posted to payback any learning as I proceed with drive swap or unit exchange. The Bolt OTA does what I need it to do, recording from my antenna and letting me watch on the TV or stream to my Android devices. I like the unit, hoping to make it more reliable.