connect the stick to the computer and see if it will establish an MSC connection. Once it does eject it properly and try it with the app. See if the USB connection issue persists. if it does try reloading the FW. If the issue still occurs after that it may need to be replaced.
For the videos. What is the bitrate of the videos? The WS can only stream at about 6Mb/s for a single stream. If you do 2 steams for example each could only do 3Mb/s. If your videos bitrate exceeds what the WS can do the video will buffer/stutter. Videos from GoPro for example are too high of a bitrate to stream from this device. If this is the case with your videos that will need to be converted to a lower bitrate.
