The paint issues seem to be more common, I think its because Canon is outsourcing more and more, and has difficulty keeping suppliers from cutting corners. I've seen this happen in my industry, outsource a part, then tell the supplier to cut the cost 25%, and a couple of years later, another 25%. They drive a supplier either into bankruptcy, or to cutting corners. I've seen it happen, a supplier goes bankrupt and it costs much more than was saved to rescue him or to find another.
In my experience, you don't have to drive the suppliers to do it. They'll look for ways to cut corners on their own, even if you aren't demanding lower prices, to increase their profit margin. This is why companies that work with outsourced manufacturers have to constantly be vigilant and randomly inspect those companies' factories to ensure compliance. Otherwise, they'll cut corners and you'll get stuck with the bill. I've seen this happen over and over and over.
Not to overgeneralize, but the problem seems to be worse in developing markets like China—perhaps because the business laws aren't strong enough to ensure actual consequences for contract violations. We did a group buy of products from a Chinese microphone manufacturer a few years back, and out of my batch, some products had a 100% defect rate, and the best of the products still had a double-digit defect rate. And on one product, they substituted an under-specced component, resulting in a nearly 100% failure rate. We had to manually unsolder all the defective components and replace them with the parts originally specified, at significant cost.
So I hold a very dim view of outsourced manufacturing. In theory, it is more efficient, resulting in lower costs, but if you can't trust your suppliers not to screw you, then those savings aren't a bargain.