Could be air in the hydraulic system. We had this when our rig was new and then again right after Level-Up was installed. As long as you extend and retract the slides in recommended order every time, If it air, it will work itself out. I did this about 6 cycles on ours each time we had the problem and that stopped the popping both times.
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Rick and Janice Binns
2006 MS 32TK3, Mor/Ryde Pin Box and I.S., Auto Level-Up
2012 Ford F450 6.7 L Diesel, air bags and 25K Reese Signature hitch (factory installed)
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