You'll find the same thing about Norton, people and companies leaving them because they find it doesn't work well for them.
Kaspersky is not a "new and cheap" company. It was founded in 1997, and has more than 300 million home users and 250,000 corparate clients. Of course some will leave, just the same as with every other security vendor.
As for faulty updates that mess things up for users, that also happens to every company. Including Norton. In 2007 a faulty Norton update messed up 50,000 systems in China. In 2012, a Norton update caused all XP computers with Norton installed to BSOD. http://www.sci-tech-today.com/news/Norton-Delivers-Blue-Screen-to-Some/story.xhtml?story_id=10000B60LMQO
The point is, that can happen to every vendor. Norton is an excellent product, but don't bad-mouth other vendors just because you don't happen to like their product. Your claims about Kaspersky are false in any way.