I'm sorry you've been having issues lately. With the price of Steem rocketing, we've seen a large increase in the number of new user sign-ups for Steemvoter lately, and some of our servers are reaching capacity resulting in slowdown and / or dropped votes during peak times. Premium users get moved onto a special dedicated server, as mentioned above, so that should help. We are also actively working on increasing capacity with new servers which should be coming online within the next week or so.