I have 8 SPA942 and 2 SPA504G Linksys/Cisco IP phones on a freePBX phone system and they randomly get set to Calls Forwarded and the phones randomly get locked where it asks for a password to access call log etc. I reset the phones to default reset all settings and the phones work, but still these issues come up, with or without a password being set on the phones, using firmware 6.1.5a on the SPA942 phones.
I have setup the phone system a second time from scratch and still this issue comes up. I cannot find any reason why the phones would randomly get set to calls forwarded, nor can I find any evidence that someone is logging into the phones and setting or changing the password.
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