U4919DW, keeps switching USB inputs automatically

Question

I purchased the U4919DW so I can work on 2 desktops at the same time with better productivity.  Thus far the unit works great as I have an Optiplex using the HDMI output powering 1 side with a workstation on the other side using dport.  I got my own hot key to switch USB inputs back and forth but on its own during the day the system will just switch itself to the 2nd input workstation which I will not be working on.  It does it 5-10 times a day and quite annoying as I can be working and bam it just switches on its own and I got to hit the keys to switch it back and at times it again switches back to the 2nd input immediately.  Any ideas on what can be causing this?

swamped207 · Answer

If you are using Dell Display Manager, go to the Options page/tab and see if there is an option there to "Auto-switch USB upstream ports in PBP side-by-side mode". If there is, make sure it is UNchecked.

Also, open the U4919DW Menu- Input Source. Change Auto Select to Off. Then retest.

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