Modems are designed to filter out noise but this is not foolproof with even the highest quality analog modems. Occasional dropped connections will happen. Frequent disconnections are a sign of other trouble though. Occasionally, HTC Technologies must replace, upgrade, or repair our equipment which can result in lost connections and services being unavailable. We do our best to announce these things ahead of time and to schedule them during our maintenance period.
Equipment can fail without warning at any time.
We try to post announcements when this happens as well. You may have set in your connection software a disconnect after 'x' minutes of inactivity. This is so you'll get logged out properly even if you go away from the computer without remembering to disconnect. This would not happen in the middle of a download, chat, or Web browsing, but could happen if you are composing or reading a long mail message or post. This can be viewed as a feature.