This is probably the Voice Mail Warning Indicator
(VWMI) which alerts you to messages waiting in
your telephone services' Voice Mailbox --- this is totally
separate from the cordless phone's answering machine
and is prone to 'key on' even when you do not subscribe
the telephone services' voice mail.
You can download a copy of your phones manual from
http://www.manualslib.com/download/303942/Panasonic-Kx-Tg9331t.html
( be sure to ignore the advertising large button
"start download" and use the smaller button "download"
across the top banner "downloads" "table of contents" etc. )
then enter the security-codes & select 'download pdf'' etc.
Try the section on page 39-40 about Voice Mail Service.
To summarize, Turning VM signal detection on/off:
The default setting is "On", To turn this signal "off":
1. press [MENU] # 3 3 2
2. scroll up/down to desired choice
3. press [save] [off]
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Good luck!
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