1. Check what a connection optimization you use: Settings -> Output settings -> Optimize speaker connection for «Short range» could give unstable connection.
2. Check if the speakers have good connection if you place them about 3-5 meters from each other on line of sight. That can prove that old positions were not suitable for stable connection.
3. Make sure that there are no devices nearby that could interfere with reception between SL1/SL2 and L1/L2. WiFi routers, mash routers, mobile phones and powerful power supplies should be at least 1 meter apart.
4. Make sure that the two speakers are at least 1.2m apart.
5. Please contact our support team if you are not able solve your issue.