For mine, the controller label indicates the manufacturer.
My two rear slides are Schwintek, and my DS front is Lippert.
My Lippert seems to travel the way you explained...it goes out about 1/2 way, and then the outside edge drops.....when it is almost completely extended, the inside edge drops to meet with the floor.
You problem really sounds like a connection problem.
Get out the test light now, and check voltages when things are working.
Check the controller plug for power.
Then be ready when it happens again.
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