Max, I haven't had the same issue as no one has responded here are some resources I would check out.
Lippert Troubleshooting guide for motorhomes https://www.lci1.com/assets/content/...ting_Guide.pdf
Also here is the owners manual https://www.lci1.com/assets/content/...3-Present).pdf
Also try Youtube I have had great luck in getting answers on Youtube. Here is one video where the retract problem was traced to a diode in the wiring harness.
There seems to be about 20 more videos on Lippert Leveling issues. Always a good resource.
Dealer or do it yourself - If you have a service contract there is usually a $250 deductible so it makes sense to view some videos get an idea of what is actually happening - i.e. does it do an emergency retract when you take the parking brake off? or is it something in the controller board that pertains only to Auto Retract. After you feel you are conversant in the problem call Lippert Tech service and see where it takes you. You can always go to the dealer later. Who knows you might be like the guy in the video and have Lippert send you the parts free.
First I thought it could be the outside temperature as I had issues going up in real cold weather. It took quite a bit longer and they moved real slow. but since the front go up and the back don't it probably isn't that.