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You are probably in an iffy signal area for EV-DO coverage (or coverage period) and your phone is trying to be intelligent about switching to the tower that is giving it a stronger signal.
You can examine this yourself by going to the phone app and typing ##DEBUG# (or go to \Windows and execute fieldtrial.exe--same thing).
In the 1x section have a look at the Rx power section. You don't want to see anything lower than ~-90dbm or so (and by lower I mean greater negative numbers).
Now tap the 1x in the upper left and choose HDR from the dropdown list that appears. Now take a look at the Rx Power value and note how it compares to the 1x one you looked at before.
If the HDR Rx power is lower (i.e. a higher negative number) and it is lower than -90 or so, then your phone is switching to 1x because it's deciding it doesn't have enough signal from the EV tower to work well.
If the EV signal is higher than the 1x signal then there may be an EV-DO authentication issue. In fieldtrial in the HDR section make sure that the AN/AAA authentication value (last one in the list) shows "1=Authenticated". If it says 0 then you need to call Sprint Tech Support and have them reprovision your phone--tell them it's failing authentication.
It's more likely a ping-pong issue due to low EV signal. Lots of other people have had that problem and there is a fix, though you may not like it (but it will allow you to get on the net and solve the battery drain problems). You can force the phone into 1x-only mode. That will allow calls and data connection at 1x speeds. To do that you have to set a registry entry. If you're comfortable with that have a look at the last page of the "registry edits" thread in this forum... someone just posted the entry you need to edit.
Once you've done that, go into Start->Settings->Phone->Services tab and scroll in the list to find "Mode of Operation" and set it to 1x only... hit OK and your phone will make the switch (requires a soft reset).
Don't be tempted to choose EV-DO only from that list (unless it's just for testing). EV-DO cannot carry voice calls so if you lock it in that mode then you will lose the ability to receive calls (interestingly your phone will still switch to 1x to place calls). Hybrid is the normal choice which allows the phone to pick the stronger signal.
Hope this helps.
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