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create /etc/modprobe.d/8192cu-disable-power-management.conf with the code below:
# Disable power management in the 8192cu driver. This works around a bug in
# some hardware where the device never wakes back up.
# Credit goes to Saqib Razaq (https://github.com/s-razaq) for the fix.

# rtw_power_mgnt=0 disables power saving
# rtw_enusbss=0 disables USB autosuspend
options 8192cu rtw_power_mgnt=0 rtw_enusbss=0