Shifting issues

What is your question?

I have owned my jeep for 4 yrs or more. I let my husband drive the jeep which he shared with our 21 yr old daughter. About a month ago my husband told me we are having shifting issue's,he said that while driving at 45mph the transmission would down shift for no reason, (no brake was applied or deceleration started) I drove the jeep in both 4wh and 2wh and noticed little change in its shifting. Thinking my husband was nuts I started driving Jeep daily to and from work about 10 miles. Recently in the last few weeks I did start having issues when accelerating. The transmission acted as if it didn't want to shift into 2nd gear, I found if I raised rpm then released gas peddle this would solve issue, going into 3rd gear never seemed dificult, and no extra prompts were needed. Last week the jeep just stopped going into 2nd gear at all unless forced by useing gear shifter. I have kept up on transmission fluids, all have been ok and needed very little fluid. when it stopped going into 2nd gear this week i did a full under body check. No the fluid does not a burnt look or smell, and has been at proper level. There is a line that has a leak and it looks as if it is also leaking around tranny seal of pan area. Did I mention 1st gear works, reverse, and park also work with no hesitation, I am going to try new filter but like I said fluid is clean before tranny and at the back where the plug hole is. Any possible Ideas friends dont think filter is issue. Help need to drive not walk to work.