How it works
Power cycling turns equipment off and back on through an appropriate procedure. Some instructions include disconnecting external power for a specified interval; others use a normal software shutdown. An internal battery can keep a laptop partly powered even when its charger is removed. Follow the model's instructions rather than treating every device as electrically identical. Power cycling does not normally erase configuration in the way a factory reset does.
Restarting a router can clear a temporary operating state, but also interrupts internet access for every connected user. In a setup with separate modem and router, the supported restart order can matter. A temporary improvement is useful evidence, not proof that the underlying connection or hardware is repaired. Repeated daily restarts can hide an ongoing fault that should be diagnosed from timing and symptoms.
Practical checks
Save work and ensure the equipment is not installing firmware or completing a critical write operation. Use the intended shutdown method and documented wait or restart sequence. Allow normal startup indicators to settle, then test the same failing task. Record whether only one device or all users recovered. If the problem returns, investigate the relevant power, connection or software cause instead of using endless cycles as maintenance. Never open a mains-powered supply to discharge it yourself.