SE2717H, randomly switches inputs

We purchased the SE2717H around black Friday 2018 from Office Depot. When the SE2717H is on Auto Select On for Input Source and I connect to my computer using the HDMI cord, it will turn on and show what is appropriate, but any slight disruption (typing hard, bumping the desk, etc) that might cause the SE2717H to move, it will kick into a frenzy of switching inputs. It will go to VGA, recognize nothing is plugged in, then enter Self Test mode. The Self Test never completes and it might go back to trying to detect the VGA signal or try to detect HDMI. If it does land back to HDMI, the image could be there for half of a second or up to an hour, then it will continue to keep switching. Sometimes if it lands on the VGA with no input, it might go to sleep. Then, it will wake itself from the sleep and continue this cycle. I have tried the Hard Reset, but it has not helped. the situation. Any recommendations? I am currently connected using a Dell Inspiron 5000 series 2-in-1 with an Intel UHD Graphics 620 card via the  HDMI output into the SE2717H using a generic HDMI cable (have tried multiple with the same issue).