Phone randomly reboots, No service intermittanly on power up HELP! - Galaxy S II General

Hi All,
I have this random problem with my SGS2. (Vodaphone)
It works fine most of the time, except sometimes when i switch off and back on again the phone part of the SGS will not start and i get no service. This can sometimes go for hours on end. What makes it worse is that if yu try and reset the radio by going into flight mode then out again it wont go out of flight mode.
It has also rebooted on e a few times recently for no apparent reason.
Any Suggestions?

Have you modified it in any way?
If the answer is "no", and it's still under warranty, take it back to the shop.

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Any ideas?
Instead of soft resetting, try switching flight mode on, wait a few seconds and turn it off. Many folks have found this beats doing the soft reset. Inshallah they'll fix this with a ROM update.
I tried that and it does not seem to fix the problem reliably.
mine was doing the exact same thing. i found that if i went to start and then chose "phone" or by pressing the send button, I got my service back. I noticed this especially after using a program that closes all apps. when the "phone" app closed then no service.

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Did you tried to hard reset your Wizard by resetting while holding Comm Manager and Voice Command button?
Yeap, runs through the set up, gets to the screen where it says "customizing in 3...2...1" and shuts off.
Well, today, it completely died. Won't turn on, tried a new battery.....nothing. Do you think, since it won't turn on, I may be able to sneak it by Exchange By Mail???
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I had the problem with the phone originally. Installed a program, did a restart, and no phone. Restarted a couple of times...even removed the program (assuming it had something to do with the program I'd installed). Did a Hard Reset, still no phone. Called tech support...not suggestions.
So I did an HPSL, and when the phone restarted (no new ROM yet), the phone radio restarted. Later, just turned off, and back on a minute or two later...the problem returned. So, I flashed a ROM from here. Radio started fine. Installed a couple of CABs (not the same as the first program), and when on required a restart...bam, problem returns.
And each time it restarts with the phone radio not working, it freezes a lot. When the phone radio is on, I don't have that problem.
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Otherwise, I love the phone, but can anyone help or offer suggestions?
if it is happening across multiple roms, I'd say hardware fault, go for an exchange.
It should never have a problem with the radio restarting, or turning on. It's defective for sure.
From what I can tell, the radio rom on some HD2's are faulty. My problem isn't as bad as yours but still I'm getting this thing replaced. There should be no time ever in the middle of Manhattan that I have "G" instead of "3G".

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The problem: If I power off my phone, it will cause it to go into a bootloop, not going past the first screen (Samsung Galaxy S5, powered by android). I haven't found a reliable way to fix it from the loop, but I usually just remove the battery, wait, and try again until somehow it just works and boots up. This is extremely problematic because sometimes my battery runs out and after charging I'll have to go through this game of chance again until my phone works.
The next problem also adds to this frustration as well. When I attempt to pick up a call, my phone will sometimes just not work and restart itself. This leads to lots of confusion and I can't call them back for some time because the phone is stuck in a bootloop.
In the few times that I do get my phone to actually boot up, everything works fine except sometimes my Wifi just doesn't work. It gets stuck on "turning on" where the notification drawer quick setting icon is dim green and never gets to the turned on full green state, eventually just turning itself off (no green color).
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The calling problem may be caused by the google dialer app not being set as the the default phone app but as for the other issues i have no idea a factory reset is a good start though
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