I want to share my experiences - I have not searched for an issue.
Same issue here - but not limited to terminal - occurs also in Graphical mode (KDE). When the screen flickers it flickers both in GUI and terminal.
The flickering is fast moving left and right. Sometimes the top ~1/5 of the display is displayed in the bottom.
I am not sure if the flickering is triggered by toggling windows (Alt-TAB) or it just occurs randomly.
Closing the lid (suspend) and opening the lid again makes the machine usable again.