I have been trading stocks for a while now and have never had this problem before as I stick to trading liquid large cap stocks. I set up a new trading account 3 months ago with my current broker. In the last few days I got an email stating I might be forced to exit a short position on 400 SPY because of a borrowing problem. The 400 SPY is a part of a pairs trade which I dont want to exit at this point. The SPY is one of the most liquid ETF'S. Is this normal to receive an email asking or telling you to cover a short when you are tradign liquid stocks, I could understand if it was a low cap stock.