I have a Vokera Linea 28 boiler which intermittently fails to ignite. The
light on the front flashes red and I get an error number. The strange thing
is that it is only when the weather is colder, and only usually between 5pm
to 7pm. It might do this four or five times per year between Sept and
March.

I'm led to thinking that this may be a localised gas pressure issue (5-7pm
people will have their hobs/ovens on, and their CH systems will be getting
the house warm for the evening), or maybe something to do with the gas pipe.

Question is, should I be concerned about this and seek a resolution, or just
resign to re-setting the boiler now and again?