Bandwidth
There's no way around it, but all video conferencing technologies use huge amounts of bandwidth. Video communication is based on sending complex sets of data packets back and forth from device to device. If your cell connection fluctuates, or WiFi connection is experiencing a glitch (through latency, jitter or packet loss), the flow of data packets will be interrupted, and it takes time to catch up.
Continuously being disconnected during meetings
If you are experiencing issues with being constantly disconnected after you join meetings, try joining again using the link in your email invitation. Alternatively, you can join directly from the Webex meetings site. Provided the meeting is still in progress you should be able to re-join.
WiFi network connectivity
You should also check your WiFi network for obstacles such as a firewall, that may not allow you to join Webex.
Cisco WebEx Meetings fails due to Java issues
FIPS causing inability to connect to Webex Site or Admin Site
CUCM settings preventing users from connecting to outside phones