Has happened to me once so far when I was leaving Rivendell and heading through the high moor today. Not sure what's causing it but it's very annoying to say the least. Maybe they just are not feeding those ponies and horses enough grain.
I thought it was just my net acting up, but it happened to me twice on the one trip from Rivendell to Echad Candelleth. Logging out and back in just lets you continue from where you left off. Not sure if I had the TP store or map up, but I probably did as there isn't much else to do on those horse rides.
EDIT: Of course I wrote this message while taking a third attempt at the same trip, and I froze again. Didn't have the map or TP store up.
Me, too. Three times in Forochel. Had the map open on at least two of these occasions. Logging off/on continued the ride once. I haven't submitted a ticket yet because I decided to check the forums first to see if it was widespread. Guess I will, next time.
There have been a number of issues with mounts stopping and with hitching/stuttering in game, apparently related to issues in the game coding. There's a dev post indicating they think they have identified the underlying problem and hope to have the fix in the 6.1 game update. Fingers crossed!
They don't seem close to fixing it. Rather, it seems to be getting worse. It first started with me when rides wouldn't complete, stopping short of the end stable. Then I had a few that wouldn't go and I had to repay for a ride. Tonight I had a new one. I got the splash screen to change zones, then it came back, with the ride returning to the start stable and didn't come close.
They can't keep rides coded properly. Why would anyone pay for real content?