I´ve got a HTC one (un-rooted, factory default), bought without a contract at MediaMarkt in Stockholm/Sweden, that has started rebooting itself randomly, and when it comes into the OS it doesnt seem to boot correctly.
It often skips the PIN-code and I can access the phone, but it will not connect to my cellphone network-provider (it shows the 5 bars with an X-symbol).
I can still connect to my wifi at home and access all (I havnt tried all, but most) of the apps.
When i go into "search for available networks" it says it cant be done because of an unexpected failure.
It often, but not always, asks me if I want to send a failure-report to HTC.
Sometimes the phone sits like this for hours, but usually it takes about 30-40 sec, then it reboots itself without any prompt. Usually into the same mode and it can keep on rebooting itself for 5-20 times before finally asking me for a PIN number and starting up normally.
I´ve tried starting in Safe Mode and still get the same issue.
I found a simular post here, although I have never rooted my HTC one: http://forum.xda-developers.com/show...php?p=50888522
Any ideas to what might be causing this?
INFOversion-misc: PVT SHIP S-ON
finished. total time: 0.041s
Went into the log file that my phone generates for HTC
And it reads:
 ramdump_show_rst_msg: KP: subsystem_restart_wq_func [de756080]: failed to power up external_modem! 
Any additional info needed?