There is the off chance that if your oil is a bit dirtier , you could try change the trany oil and filter and see what, if any difference that makes. After that perhaps some scanner diagnosis may help with some information. There is always that possiblility that it could be the start of a bigger problem. I'd probably suggest having it looked at sooner rather than later and maybe you can minimize expenses if something minor is found.
No one can give you any solid answers from here. Someone needs to look at it and evaluate it in person. Just make sure you are dealing with a knowledgable transmission place or person.