This may happen when the wifi signal is weak in your garage. You may try to re-position your router to get better signal in the garage. Another possibility is the router itself. Your router may be operating at capacity. Any extra load will make the router to disconnect some of the devices. This may be fixed by upgrading your router. If your router is good, you may check the signal from your ISP. If the the signal from your ISP is noisy, you may experience frequent disconnects from your devices. To fix this, you may phone your ISP help line to investigate. If none of these helps, then post your question again.