You might want to take a look at the fuel filter. They have been known to cause intermittent problems.
had a good suggestion with the Seafoam. It's a simple application and it just might do the trick.
Long ago I found that troubleshooting fuel problems can be frustrating. That's what got me into rebuilding carbs. I got pretty good at it. I discovered that it was simpler to just go ahead and rebuild a carb if it was suspect.
What makes a carb suspect?
If it's been sitting for six months or more.
You notice corrosion in the fuel (tank)
Has never been rebuilt and is 3-5 yrs old or older
Chronic fuel issues
The need to keep changing the fuel filter
I know that you said you're not mechanically inclined. I am not suggesting that you attempt to rebuild the carbs. However, I think you might want to consider having them done at a shop or by someone you know that is skilled in such things. If I were nearby I'd do it for you. If you have someone you know do it just make sure they know how to sync carbs.
So many times I run into people that try hard to avoid rebuilding their carbs. Truth is; it isn't really that big of a deal. And if your bike qualifies as 'suspect', rebuilding them gives you a piece of mind knowing that the carbs are clean and efficient.