2015 Retina 13" MBP freezing on wake when connected to Dell P2715Q
I have two identical (hardware-wise) systems suffering identical symptoms.
MacBook Pro (Retina, 13-inch, Early 2015)
3.1 GHz Intel Core i7
16 GB 1867 MHz DDR3
Intel Iris Graphics 6100 1536 MB
Both have had their logic boards replaced by Apple, but the issue persists.
When the system goes to sleep while connected to the Dell P2715Q via the Thunderbolt 2 port going to the Displayport port on the Dell, and is subsequently woken from sleep, the MBP [sometimes] freezes. The cursor stops moving, the Dell display goes black (but does NOT display the "no signal" message), nothing responds.
Even the taptic feedback on the touchpad stops responding.
I haven't noticed this issue on any other display model, but since 80% of our displays are P2715Qs it can't be ruled out. I have not had this happen from the HDMI port, but again have not intentionally tested for it.
Most of our systems are 15" MBPs or 13" MBAs, and those systems do not suffer this issue ever.
Any help would be very much appreciated, as this is causing some severe work loss.
MacBook Pro with Retina display, macOS Sierra (10.12.2)