Are your long running ssh agent sockets failing? Perhaps something is cleaning /tmp? This rc file for ssh fixes all these problems.

Fix ssh sockets in Tmux and Screen,

# Fix ssh sockets in Tmux and Screen - dmcanulty 2021-2026 - https://gist.github.com/tsaavik/c0512d2d2d138a45d0db45fc4c410277

# After putting THIS file at ~/.ssh/rc add the following to your Tmux or Screen confs
#   .tmux.conf -   set-environment -g 'SSH_AUTH_SOCK' ~/.ssh/ssh_auth_sock
#   .screenrc  -   setenv SSH_AUTH_SOCK $HOME/.ssh/ssh_auth_sock

# Now add the following to your ~/.ssh/config to prevent /tmp reapers from getting it
#    Host *
#        IdentityAgent ~/.ssh/ssh_auth_sock

# Multiple Putty sessions issues? Enable `connection->ssh->Share SSH connetions`

# This is the actual code. If symlink dosn't point at a socket and env variable is valid socket, make a symlink
if [ ! -S ~/.ssh/ssh_auth_sock ] && [ -S "$SSH_AUTH_SOCK" ]; then
    ln -sf $SSH_AUTH_SOCK ~/.ssh/ssh_auth_sock
fi