bro I dont know what you mean? what you mean dropping? when drops? how many minutes you try to keep connected? how much you pay for 1gb? etc etc.. there are many parameters that related with connection quality.
if you need price performance proxy, I suggest lunaproxy. Its cheap and have huge ip pool but speed is not fast. If you need high quality (offcourse pricy), you can check froxy.com
They have good quality proxy service but real expensive when you compare with lunaproxy
(By the way, I am not in proxy business, I dont know those companies' owners, this is not affilate or this is not ad, its just 8 years experience based comment)