I purchased the Lenovo dock for my 13" non-touch bar because
1) my Caldigit TS3 Lite would get freaky with my laptop when it went to sleep or was unplugged from the monitor - screen flashing and strange redraw regions making forced shutdowns a regular activity
2) my pre-order of the OWC Thunderbolt 3 dock still hasn't shipped
I don't have two monitors to test with, but my Dell 4K works fine through the Thunderbolt 3 port on the front, and I have no sleep/disconnection problems. It's also a lot lighter than the TS3, and I travel occasionally with it.
I'm still using the TS3 Lite, and I haven't seen that behavior with a pair of Acer 4K displays with one on DP, and the other on Thunderbolt 3 to DP.
Might be worth an email to Caldigit tech support on that.
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