I have had a similiar issue with mine. It actually went out a couple times on us. More recently now that we have been having more regular cooler weather (30's day, and 20's night) the wife hasn't reported any issues.
It is pretty easy to look at the settings in the Logo! control panel. Mine was factory set to run 3 min every 30min between cycles. I changed mine to 4 min. Not sure if that was a wise thing or not, but it's what I did. At the time we had issues, were the days when it was still in the 60's during the day , the boiler litterally wouldn't call all day except the 3 min. To compound that, I was really pushing it with the wood quality, really cramming some questionably wet stuff in there, experimenting with what I could get away with.
My situation is a little unique, I go to sea for a living, so my wife and son have to take care of the heating when I am gone. I need it to work with no issues while I am gone. The wife's onboard, but I also don't want to make it hard at all, or I'll risk her jumping off that wagon.