[Koha] Getting 503 Service Unavailable every day on Koha 22.11.03

[Evan Stewart]

Recently, I've been getting many 503-Service Unavailable failures running
22.11.03.

My librarian reports that Koha crashes when he is adding/editing a record
or trying a Z39. 50/SRU search.  In the past week, the server has stalled
at least once a day while the librarian is managing records.

If I restart the server, everything starts working again. It seems like
this is a capacity problem and the server is freezing, but I don't know
what's causing it.

I'm using an Amazon Lightsail instance, running Debian with 2 GB RAM, 1
vCPU.  I know this is a very slim resource, but the instance has been
working without crashing for over a year. The library has grown by
thousands of records over the year, so I'm wondering if I need to bump up
the RAM.

Looking for advice on minimum RAM that is suggested for a Koha 22.11
instance.

Any suggestions?

-Evan
Africa's Hope, USA