Flickering LCD & errors on console (Prusa MK2S and Repetier Server Pro v0.92)

BiSProps

Before updating to 0.92, I had no issues with two Prusa MK2S connected to a single Repetier Server running on RPi. Now, one of them has continuous errors and a flickering screen when connected to the server. If I unplug the USB cable, the display goes back to stable. 

Any ideas about how to fix this? 

2:35:32.441: Error:Line Number is not Last Line Number+1, Last Line: 0

2:35:32.441: Resend: 1

2:35:32.452: Resend: N6 G92 E0

2:35:32.452: Resend: N7 G90

2:35:32.452: Resend: N8 M82

2:35:32.461: Error:Line Number is not Last Line Number+1, Last Line: 0

2:35:32.461: Resend: 1

2:35:32.472: Resend: N9 G21

2:35:32.482: Error:Line Number is not Last Line Number+1, Last Line: 0

2:35:32.482: Resend: 1

2:35:32.493: Resend: M117 192.168.100.241:3344

2:35:32.567: Error:Line Number is not Last Line Number+1, Last Line: 0

2:35:32.571: Resend: 1

2:35:32.592: Error:Line Number is not Last Line Number+1, Last Line: 0

2:35:32.592: Resend: 1

2:35:32.612: Error:Line Number is not Last Line Number+1, Last Line: 0

2:35:32.612: Resend: 1

2:35:32.633: Error:Line Number is not Last Line Number+1, Last Line: 0

2:35:32.633: Resend: 1

2:35:32.644: Resend: M117 192.168.100.241:3344

2:35:32.657: Error:Line Number is not Last Line Number+1, Last Line: 0

2:35:32.657: Resend: 1

2:35:32.657: Resend after 261ms

2:35:32.669: Resend: N1 M110

2:35:32.669: Resend: N3 M115

2:35:32.703: Resend: N4 M220 S100

BiSProps

Nevermind...I think I got it. The one that was flickering was on an older firmware (3.1). I just flashed it up to 3.2.3, and the flickering seems to have cleared up.