Gabor Szakacs

My aging Kyocera 2135 has recently started to act up, but I'm
reluctant to replace it because the newer phones don't have
the features I like (rugged single piece with no unnecessary
gadgets or buttons).

Sometimes it will reset (beep then startup "Verizon" screen, searching,
etc. as if I had just turned it on).

If I leave it on the charger it tends to shut off (screen reads "charge
is complete, phone is off").

Sometimes when I turn the phone back on I see
prl.c
5209

It may or may not recover from that state. If not I sometimes
need to remove and replace the battery pack.

Has anyone else seen this sort of behavior? If so
is it fixable or do I need to bite the bullet and "upgrade"
to a new phone with all the annoyances that go with it?

Thanks for any help,

Gabor