Same here, flew yesterday afternoon using a S8+ no OTG. Really bad steam quality and I was getting loss of video signal 200 feet up and about 300 feet away. This was in my back yard where I had no issues before.
Everything went great setting up the drone. I flew around my back yard a bunch of times, then took her out for a couple of flights at the local lake. Here is the footage:
My Spark is going to be delivered tomorrow. Can't wait to try it out. I'm a noob at this. Flew a Parrot AR a few times and that's about it. I've been watching a lot of videos on the setup of the drone. Hopefully I don't run into any issues tomorrow.