Enviro Meridian

I don't have your stove, but I have one that's almost exactly the same, a VistaFlame VF100 (also made by Sherwood Industries like yours).

I find that after about 24 hours of burning (about 1-1.5 bags depending on outside temperature) if you are starting to see a buildup in the burn pot liner, you may need a touch more combustion air. Try pulling out the draft rod about 1/4".

In any case, if I shut my stove down for any reason, it gets cleaned. (why not, right?) So if you're saying it won't relight after shutdown (perhaps due to a buildup of ashes), why not help the stove out a bit and at least empty the burn pot liner as well as the burn pot? Also, make sure there is no ash in the ignitor tube.

Sounds like it could be several things.

First has the stove always done this, if the answer is yes, clean the stove and venting out and open the damper a little bit as suggested above.

If the answer is no, then you have missed something in cleaning.

The vent must also be kept clean, especially if you are operating at the limit for whatever size vent pipe you are running.

Other things that can impact your burn is drawing inside air while a number of exhaust fans are running.

I have a Regency GFI55 which Im told is the same as the meridian. I shut my stove down every 2 or 3 days and give it a quick vac and scrape the pot out. Burn pot is never full of ash, I would try increasing your damper a little at a time to get that nice yellow/orange flame that just shy of a blow torch and kind of jumping all over. I find that with this kind of flame and the pellets dropping in the pot it bounces the hot embers out and the pot stays pretty clean except for the outer corners. If you think your damper setting is good try increasing your combustion blower speed 1 step, let it burn for 30 mins and check the pot for buildup or try dropping your feed rate 1 step and watching again for results.