We use Dell WD-19 docks. Not sure if you use similar. Updated dock firmware and laptop drivers made a difference for us with connection issues. Sometimes you gotta perform a reset on them to make them behave (disconnect dock power and USB-C and hold power button for just over 15 sec). Sometimes the laptop NVRAM needs to be reset instead (for Dell, disconnect all devices and power while off and hold button for just over 30 sec). Overall, though, no huge issues with DP specifically if the dock and laptop firmwares are up to date. Third-party docks/replicators definitely have way more issues, though.