You won’t hatch any eggs at 97 either!  I had one Amazon bubble that I had to run at 103 to get it to maintain 99, did fine otherwise.  My borrowed nr360 was a degree cold but hatched fine once I discovered thermometers (but hate the lid).  The little giant said 99 but ran 105 no matter what it was set at.  Another Amazon one gave me 3 live chicks out of 18 fertile eggs due to a faulty turner but the temp was great.  My current favorite is another Amazon one (ran the same model last year but the heater gave out and couldn’t get above 98).  Incubators seem to each have their own quirks even name brand!  Not sure on longevity either between cheap and name brand (number of incubation days not years it sits in the closet!).  What changed on your nr to cause the temp crash?  Dying heater, draft, dog knocked lid off?  An incubator that can’t maintain a steady temp is worthless, if you can get the temp up on the Amazon one it might be the better incubator at the moment!