I bought the car a few weeks ago and driving round town is fine. Took it for its first hundred odd mile trip this week - after about 80 miles the gearbox would stick in whatever gear it was in and took a lot of pull to change gears, parked up a couple of hours and on my return it was fine. All week been doing trips round towns and has been fine once more. Returned home today and once again after 50 miles started sticking again, pulled into cafe and had coffee- fine again for 20 miles, seems if I stop for a few minutes it works without issue for a few more miles.Hoping someone might have a clue whats causing this, I'm thinking transmission oil but I'm no mechanic!... thanks in advance