Terminal "Connection Closed" getting this constantly (Hands-On Lab)

for 3 days now i constantly get
“Connection Closed”
errors and lose
my inet performance is 60mbps download and 22mbps upload
makes doing Labs almost undoable; catatonic delays prior to “Connection Closed” banner; keystroke-slowness, losing my command history & screen; then
i am re-taking the exam next Friday, 5 May.
pls help