MiFi 4510L Problems - unable to browse web but can ping !

Have had stationary 4510L for months since my local store rep convinced me to upgrade my perfectly good 2200. Wish I had never done so. First the 4G/3G connect issues kept me from working until the recent firmware patch was finally released. But mixed in with that issue is another one that has gotten progressively worse. Three replacement devices and two new SIM cards later and I still have the issue. After three (alleged) trips to the tower reporting no issue, I decided to take the MiFi on the road to see if I have same issues on another tower. I do. Anybody else seen these symptoms or have any suggestions?
1) Browsing fine, usually in forced 3G (EVDO) mode due to earlier issue resolved by firmware upgrade.
2) Suddenly web sites stop responding with timeouts, or server unavailable, or web site taking too long to respond messages (depending upon browser in use).
3) WiFi connection is good and I can browse locally to access modem.
4) Modem states to be connected and not dormant, with decent EVDO signal strength.
5) Connection log shows some TCP and UDP traffic.
But cannot browse anywhere. The only fix is to disconnect and reconnect. Then it all works fine. The WiFi connection is never lost. Don't need to reset the modem, just drop the call and then reconnect.
Logged 12 to 15 calls on this and have not gotten satisfactory response yet. Spent hours and hours collecting data on dates, times, screenshots, etc. Two very interesting things that I think would be indicative of issue:
1) Even though I can't browse web sites, I can ping them !!
It's as though internet layer protocols are working but transport layer are not. When I can't browse, I also lose my VPN connection (if a session was established). Cannot reconnect VPN, says the server does not respond, but I can ping it!
And in the Connection Log, I can see the ICMP traffic from the ping, along with TCP and UDP. Yet cannot browse to any website.
2) Once this problem occurs, the clock starts to drift from real time. The time stamps in the Connection Log and in the System Log are a few minutes off, then ten to fifteen minutes off, then withyin a few days they are an hour off. They occasionally show 1980!! A hard reset re-synchs the timestamps to the system clock.
*ANYBODY* have these symptoms or any suggestions? And if you have issue where browsing stops, but WiFi is still wokring, try pinging the website and see if you get a response. I'd like to hear form you.

I have the *exact* same problem. Been happening for months and nobody at Verizon has a clue. I am going insane!!! My problem is especially worse when I have more than one WiFi client connected. "Stop browsing" means unable to browse the internet. I can still browse on the local MiFi private network fine. Just can't browse thru the Verizon network!
One laptop will stop browsing (but can still ping!!) while the others are working just fine. Dropping the wireless and reconnecting doesn't fix it. Rebooting the laptop doesn't fix it.
One client can browse but the other can't (but both can ping) and there is nooooo way to fix it but disconnect the call and then reconnect. FRUS.STRAT.TING !!!!!
Happening now five or six times per day. We may have two to four laptops connected at any given time. Mostly we just do w/o internet on the clients when they stop browsing. The other laptops will continue to browse for quite some time. Eventually, when the working systems have an opportunity, we have to drop the MiFi call and reconnect to restore internet to everybody.
THIS IS KILLING ME.
I cancelled my voice service this week and transferred to ATT. T-mobile has a $40/month 5GB plan that does not charge for overages. I'm considering switching to that. Verizon, how many customers will you lose before you get your act together?
MiFi 4510L - replaced twice, latest one is three weeks old
Modem Firmware - 2.16.07 (the latest),
Using EvDO with better than -80 signal strength

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