Possibly buying a 1998 328i sedan with tranny issue. Need some advice.

Hello, so I found this mint looking white with gray interior, sport package 98 328i, car is perfect running as far as engine and everything working as it should electronically. Car has 181,000 miles and is mostly all freeway 1-owner car. They claim trans has issues, drove the car and it seemed to be fine, has a semi firm shift every once and awhile, but when you put it in D it goes smooth and quick to engage, same with reverse, but as soon as you start backing up sometimes it will disengage and you hit the gas and it will engage again. The owner says sometimes in the morning D will do the same, with a slight noise, but most of the time the trans shifts as it should, no Check Engine Light or Trans malfunction light, could it be low on fluid or maybe just need a service? I have the opportunity of getting this car with no dents and perfect garaged paint and brand new tires for $1,300 I think its a good idea, even the front Harman/Kardon speakers aren't buzzy light most at this point. PLEASE HELP! Should I do it?

Possibly buying a 1998 328i sedan with tranny issue. Need some advice.