Unfortunately, the GE link bulbs have a known firmware problem which is of particular concern to people with mobility issues. It causes them to drop off the network from time to time, and then they have to be reset, usually with the blink method. Which of course defeats the whole point of using the home automation system so you don’t have to fool with switches. This known problem is the reason that the GE Link bulbs are NOT on the official "works with SmartThings list.
As an alternative, you should be able to use a different Zigbee bulb. The Osram Lightify is probably the most popular for this purpose. The $15 Hue White (the new model which just came out and is replacing the hue lux) is another candidate, although that one is not officially supported and there are a couple of tricky aspects to it.
Anyway, I originally got some GE links and ended up replacing them because it was so much trouble resetting them when they went off-line. An able-bodied person may not care quite as much, but it is something to be aware of.
See the following FAQ: