Sadly this is an older Intel adapter that really isn't actively supported by Intel anymore. There are some driver options that sometimes help with this adapter you can try this:
sudo -u $USER /bin/bash -lc 'lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs sudo rmmod && sleep 3 && sudo modprobe iwlwifi 11n_disable=8 bt_coex_active=0'
That command will load new driver options. The changes will only remain in place for the current session. If those options help then a permanent driver options configuration file must be created for the changes to be made persistent.
Please post the output of that command, and any changes you notice in your connectivity afterwards.