Why does my clothes dryer cause my power to go out at end of cycle?

I just purchased a new home (built in 1980) as well as a used washer dryer. I noticed the last two times I have done laundry that the washer dryer both run just fine, except when the cycle of the dryer ends. Right at the end where it would chime, the power in my whole home goes out for a second and then immediately comes back on. No circuit breakers are tripped. What could be the issue?

I know the outlet for the dryer is a 3 prong chord. Not sure if this is relevant.

Thank yoU!