I've been working with WordPress for about 9 months now. I would consider myself advanced in regards to WordPress work. I am fairly proficient in CSS and HTML, with a tiny bit of PHP and MySQL skill.
I currently have about 5 sites that I created and that I manage. 4/5 of these sites seem to always have little problems here and there. I use Elegant Themes, WMPU plugins, and a few random plugins here and there. But I have one client who has an issue every week.
For example, Appointments+ isn't accepting appointments for certain time slot. Or WPMU Events isn't showing any RSVP's. Or my spam protection is marking all the sites users as spammers and blocking them.
I know that my development cycle isn't as refined as it could be, and that my processes could be a little better defined. I also know that Webmastery and Development is a constant give and take between users, clients, browsers, and me.
My question: Is it normal to have things glitch out or go awry this often?
I would love to be able to build sites that I could hand over to clients, rather than be the go to guy every three days.