Lumia 800 locks up on making call

Just today my Lumia 800 has started locking up making a call.
The instant I press the number, the screen goes black. The call goes through and I can talk but I have to long-press the power and reboot.  The call is then not in the call history either.
Anyone else experienced this?
Only thing that has changed since it worked was updates to marketplace apps. Could one of those be the problem?
1991...........................................................................................................................................................2013
1610 • 5110 • 3210 • 8210 • 8310 • 7210 • 6230 • 6630 • N80 • N70 • N73 • N958GB • N900 • Lumia 800 • Lumia 820

Hi Jimmy
I have never managed to get a soft reset to work. I never get three buzzes (which I believe you are supposed to get).
It just stays blank til I release the buttons.
Anyhow, that hasn't cured it.
1991...........................................................................................................................................................2013
1610 • 5110 • 3210 • 8210 • 8310 • 7210 • 6230 • 6630 • N80 • N70 • N73 • N958GB • N900 • Lumia 800 • Lumia 820

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    OS: “7.10.7740.16”
    Firmware: 1600.2475.7720.11414
    Hardware: 112.1402.2.3
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    3.     In all cases, the claim that the phone can be several days in sand-by mode, must be wrong and Nokia must address and explain this.
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    I would like to thank all the people here who have taken the time to put all this info together for us all and hope it is of help to the folks who are having trouble with battery life. I'm not doing to bad on battery life myself as it always last me though the working part of the day when I don’t have access to a charger and I will soon be updating my car cradle to take the Lumia so will have access to a charger though the day to. Personally I have come from the N900 and that phone also had some battery issues when it first came out which where pretty much sorted over time, as for manufactures claims on battery life, I always read these figures the same way I would read expected miles per gallon that car manufactures put out, meaning that there would only be a very select few that would ever get what the manufactures say you can get the rest of us will all get a very wide variation on these figures. I know that Nokia have acknowledged that there is an issue with battery life and not all of us have this issue, at this moment in time I'm not to unhappy with the battery life, but if it improves then I will be pleased. From all the posts I have read on this site it does seem that some people do read manufactures specifications as if there are set in stone, I'm not criticizing anyone here would just like to say that they are trying to sell you something so have a good look at the figures and maybe check them with other independent sources if at all possible. My only disappointment really is that we have to rely on other people and not Nokia themselves to let us know what’s going on, I wish the manufacture would be more open and quicker to let us know what’s going on and what they are doing to sort out problems and some sort of time frame that we could expect something to come out to fix a problem. I know bugs can me very difficult to find and ever more difficult to fix sometimes but if Nokia put out a weekly report about how things where going on bug fixes or forth coming updates it would help everyone in deciding where they are going with their chosen product.
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