Events will not download

Why is it that event notifications and downloads of events are so sporadic and rarely work? I have done all the normal things re settings. All are 100% correct. I will have motion but no notification. I see an event days later when I check and it won’t download. This has been going on for months. They really want you to buy their monitoring service? With these kind of results, they would go out of business with the liability they would have for deceitful service.