2000 Suburban 3/4t tranny problem

[96ss1664]

I have a 00 suburban 3/4t 4x4 6.0L with the 4l80E tranny. Here is what started it would every know and then go to limp mode after it shifted from 1st to second it really wouldnt shift hard or anything when it would do this. Well know it done it 3 times today, when I put the tilt wheel down after I start the truck the gauge cluster goes blank till I get positioned then power will come back. Well on the way home it started shifting hard from 1 to 2 and 2 to 3, it never went to limp mode but I noticed when it shifted hard between gears it felt like a older truck with a shift kit, but when it shifted the gauge cluster would lose power for a second then come back. Tranny fluid is pink no burnt color or smell does not slip, I let it sit for awhile then drove it up the road to get gas drove like a brand new one got gas adjusted tilt wheel shifted hard shut it off and restarted drove fine back home. Any suggestions. tranny fluid and filter was changed at dealership 12000 miles ago.

[GM-Tech]

Sounds like a possible ignition switch. Knowing what DTC's, if any, are set would be helpful.