Maybe, but without more information it's premature to make that statement.
In fact his reply did give at least a clue.

l have 2001 Focus that sometimes dash went crazy, lights dimed/blinked,
radio went out,auto trans jumped out of gear etc. After taking to 4
dealers and spending a lot of money l purchased a service manual and fixed
it myself. All the time everything was failing the engine kept running,
because the key switch ground wire was attached to the battery ground post
with a separate screw.l finally came to the conclusion that the problem was
the primary source of power because there was no other way you could have
so many circuts fail at the same time. That means the battery ground cable
was failing. When l discovered the key did not work when the 2 wires were
disconnected from the battery ground post l was sure the ground cable
under the air cleaner was the source of the problem so l ran a jumper wire
from the screw to a body bolt. The problem went away so a week later l
pulled off the air cleaner section over the ground bolt to find it in very
dirty condition. the location of this end of the connection is convex which
allows moisture in etc. l moved the cable to the side of the fender just
ahead fo the suport bracket between the air cleaner and the battery, after
removing the paint and cleaning the cable end. Problem solved.

Sounds like a failing battery or alternator. This can be diagnosed at a
decent repair shop.