So I noticed recently that my trans gauge will rise and fall about 50 degrees every now and then, especiallly when its just getting warmed up. Also more recently, it will get warm fast. Like around 190*. I know people say this is normal, but a few months ago, it would take over 50 miles before it would even reach 130*, and now it reaches 160* in about 10 miles. Should I change fluid and flush it out? The last fluid change it had was about 60,000 miles ago.