Transmission problem with MX5 NA…

Hallö, I’ve been driving my NA for a good year now. Of course I’m totally thrilled and I’ll probably never give it back again;-) BUT: The problem is the gearbox… In the beginning everything was still wonderful, then it started to become “happy”. The gear change from the 1st to the 2nd gear and also slightly from the 2nd to the 3rd gear feels as if the gears from the gearbox did not “cramble” in each other. Then in March I drove to the friendly then the master with me a test drive and only meant “is everything completely normal, the circuit of the MX5 is now a bit crisp”! But well, he suggested to change the gear oil because with ́m new oil would run a little better. So in June the gear oil changed – and it also got a bit better but fact is that it just gets worse and worse over time! Meanwhile I switch from the 1st to idle and then carefully into the 2nd, besides the 1st gear goes quite hard (e.g. I hope you can help me! Apparently I’m probably the only one with this problem… MFG Stefan PS: Oh yes, I should mention that it’s worse in cold conditions. If I’m steamed over the highway for some time and the gearbox is really hot, the problem is practically gone! And to MX5: EZ.95 / 79000KM