Thanks to everyone on this thread for your great advice. I knew what to expect. Just got back from my trip . . . went to Hollywood Studios on Jan 30th --bad day for ROTR. Here's my experience:
I definitely opened app way too early. Go with opening it from scratch at 7:00am like others are suggesting. Luckily my aunt was on it and got boarding pass 59. Got called around early lunch time. Ride broke down and we waited in line for 1 1/2 hours! Yes, they brought us chips, bananas, water. Chewy walked by but did not stop. They said he would come back but never did. Scanned our magic bands to give us fastpasses for it later. Came back in the evening (only 3 out of 5 in my party were up to coming back). Ride broke down again, but luckily we rode most of the ride first. IMO --one of the best rides in Disney! Scanned magic bands for fastpass again. Ride never came back up. Stood in customer service line for 45 min. Nice CM gave us another day ticket and fastpasses for everyone in our party. Came back the next day late morning. Ride broke down again (after 1st 2 phases--no spoilers). Scanned magic bands for fastpasses. Came back; finally rode entire ride all the way through! Definitely an impressive ride, but more so the first time through--not the fourth Ha Ha!