A: holds dont last any set timframe...
b: they are usually because scottrades mm is short
c: It happens all the time and compalaning does help!!!
I cant tell u the number of times ive been in a pink only to have scottrade or TD or Etrade stop online buys, call and complain, it works, once their mm has covered its short they will allow online buying, very very silly of u to post such nonsense