Welcome to the neighborhood to both of you!
While I have not heard of a lot of issues with the transmissions, I do know that it sounds as if the dealerships are not filling the trannies to the proper fluid levels before delivering them to the customers/you. This unfortunately is a common issue, dealerships often scrimp on the dealer prep and do not double check the fluid levels before selling the vehicles. This sounds like the most likely source for your issues, especially if the solenoids went out that soon. The squealing is most likely from something that has ben hurt inside the transmission as a result. This is also the most likely reason for the sluggish acceleration, etc as the torque converter may not be operating properly as a result of being run on low fluid for however many miles.
That being said, this is all contingent upon both of you running stock rims and tires. I have heard of folks running large 22+ inch rims and tires having issues with transmissions and engines which could be avoided by upgrading the speed sensors.
Hope this helps.