Am I crazy or is my transmission having a issue?

My old car had a junk transmission that I drove for 2 years and in April I decided to buy a new car. It's a 2017 Ford Escape S. Within the last month of driving it I shift into drive and take off. The car goes just fine in first gear then it pops into neutral and the car slows down until the car jolts because it put itself into second gear. Then shifts as usual unless I stop at a red light and it repeats itself again. It was very sporadic so I didn't think much of it however it's doing it a lot more over the last week. Also it's being sluggish on the highway which is a brand new issue. It goes but it doesn't have the spark it usually has that really gets it moving (to me it really does go fast considering it's a 4cyl CUV). I'm bringing it to the dealer do you think it's worth a mention or is this normal? I'm really not sure. No other symptoms or lights

Added (1). My car has about 5 thousand miles btw

My alternator isn't charging my battery but we don't think it's the alternator. Any ideas?

We ve been doing all the repairs ourselves and when the battery stopped charging, we replaced the alternator. This didn't fix the problem. We took it to an electrician and he said the alternator was bad when we bought it new. So we took it back home and went to replace it again when I accidentally forgot to unplug the battery and sparks flew from the alternator when we went to take out the first bolt of the alternator, which means it did have a charge when the electrician said it didn't. We know that there are significant wiring issues due to the previous owner thinking they were a mechanic, so we think that s the issue. This car is a 2004 Ford Escape so the alternator is extremely hard to get to. We just want to know if we should continue to take it out and get it tested or just bring it back to the electrician and say it got tested and it was fine and let them move on to the next possible issue in diagnosis. Or if you have any other ideas of what it might be?

Inherited a car from a dead relative should I sell it or keep it?

So I'm not really sure what to do with this but my grandfather had a 2014 Ford Escape base model. He loved buying a new car almost every other year until he got sick so his current car only has about 10 thousand miles. I already have a 2015 Honda Civic which isn't paid off yet but due to his death his car is. I was thinking I could sell it to help with my own debt but I feel guilty selling his car that he left to me. What should I do?