It seems like there's a bug with the split-screen gesture on your Zenfone 10. Instead of allowing you to select the second app, it makes the first app disappear. Manually activating split screen works, but it's not as convenient. Try checking for sof...
It sounds like a Wi-Fi issue, possibly due to a software glitch or hardware problem. Try restarting your phone and router, clearing saved networks, or updating the software. If it continues, a factory reset or a visit to a technician might be needed.