Macbook can't find Time Capsule anymore
I bought a 2TB Time Capsule and hooked on a 1TB external hdd to it. All my files and music are on there. My Macbook Air can't find my Airport Time Capsule all of a sudden. It regularly disconnects since they day I got it but since yesterday it can't connect anymore. Internet works fine though. The utility app tells me that it used to be in my network but now isn't anymore. Could it have something to do with adding my iMac to the network? Any thoughts?
MacBook Air, OS X Yosemite (10.10.1)