[gpsd-users] gpsd only started one time (tty already opened)

[Forum]

I am trying to use gpsd on an raspberry pi.

I followed this instructions: http://www.gtkdb.de/index_36_2511.html
The first time i used it it works perfect.
But only one time - i never get started it again!

When i try to open gpsd in debug mode i see:

address@hidden gpsd /dev/ttyAMA0 -F /var/run/gpsd.sock -n -N -D 3
gpsd:INFO: launching (Version 3.6)
gpsd:ERROR: can't create IPv6 socket
gpsd:INFO: listening on port gpsd
gpsd:INFO: NTPD ntpd_link_activate: 1
gpsd:INFO: stashing device /dev/ttyAMA0 at slot 0
gpsd:INFO: opening GPS data source type 2 at '/dev/ttyAMA0'
gpsd:ERROR: /dev/ttyAMA0 already opened by another process
gpsd:ERROR: initial GPS device /dev/ttyAMA0 open failed
gpsd:INFO: running with effective group ID 20
gpsd:INFO: running with effective user ID 65534
gpsd:INFO: startup at 2015-08-08T10:26:49.000Z (1439029609)

But the interal serial interface is not used by another process and locked up.
I can open the interface without problem with minicom and see the NMEA data 
coming in.

minicom -b 9600 -o -D /dev/ttyAMA0

The baud is set correctly before opening gpsd.

address@hidden:/# stty -F /dev/ttyAMA0
speed 9600 baud; line = 0;
min = 1; time = 5;
ignbrk -brkint -icrnl -imaxbel
-opost -onlcr
-isig -icanon -iexten -echo -echoe -echok -echoctl -echoke

I have no idea what's going wrong?

Any help would be wonderful.
Thanks.