LCD Display text disappearing
Clearly the combination of the loads that you are placing on the +5V pin is causing a sag of the voltage to a level that is lower than the LCD can still remain functional. This could be a constant sag with too much load or it could be a transient fault that happens when a load switches or you try to hot plug a load. 

A constant sag situation would require that you find a separate hefty 5V supply to drive some of your load requirement. 

For the transient type situation stop hot plugging. And for a transient due to the load switching you can benefit from adding bulk capacitance to the 5V line to GND at the loads that are switching.