Ford Escape 2005 alternator/electrical issue

Hi everyone.

Hoping someone can shed some light
on my issue .

On my 2005 Ford Escape about 8
weeks ago my battery died . The
AMA guy who come to start me said
my alternator was undercharging.

I took it to the garage and they told
me the alternator needed replacing
which I had done . Then a week later I
had a power surge and lost all power
I took it back to the shop and they
said it needed a battery so I had that
changed .

Then around another week later the
same thing happens again so I took it
back to the garage and they say it
must be a faulty alternator and
change it . I pick the car up and on
the way back from the garage and it
happens again .

The garage tells me I need to take it
to ford as it’s a computer issue .

I found a mechanic online that come
over and checked the grounds and
reset the computer as it was still
reading error codes. Everything
seemed to be fine but then a week
later I am out driving and it loses
power again . Only this time every
time I stop the car the power comes
back but as soon as I put my foot on
the gas again the power goes apart
from the front windscreen wipers and
electric windows .

Does anybody have any idea ?

Thanks in advance