My suggestion is for you to stop all your current work and save everything. Now reboot the R-Pi. That will clear all the multiple screen sessions that have built up.
The "screen" utility can be built (and ported to) various OS' in many, many, ways. I am familiar with that available with RHEL, less so with the Debian version for the R-Pi.
Start your screen session with "screen -U". When you have been disconnected, possibly by some LAN/WLAN glitch, reconnect with a "screen -dr" incantation.
To completely terminate the current screen session, issue "<Ctrl-A>K". (Control-A followed by an upper-case K.)
To temporarily detach from your current screen session, issue "<Ctrl-A>d. (Control-A followed by a lower-case d.)
To re-attach to a detached screen session, it is as three lines above: "screen -dr".
If you would like to start a screen session which logs everything that occurs, "screen -L -U" would be the relevant incantation.
Finally "man 1 screen" should bring up the relevant manual page on your R-Pi.