The battery in that state could def. be giving unexplained faults of one kind or another - needs replacing sooner rarter than later.
Now, display showing '6' - the only way the No 6 shows is by putting the system into Engineering mode & asking the panel to do a Digital Communicator Test by pressing, 6.
Pressing '0' should stop this test.
Then pressing Reset, once or twice (can't remember which) should, as in should, get you back to Day Mode
acorn
August 2008