The answer to 'bee invasion' is that a bee invasion is typically caused by a swarm of bees looking for a new hive location. Symptoms include seeing a large number of bees congregating around your home, often near eaves, windows, or other entry points. Bees may also be seen flying in and out of cracks or holes in the exterior of your home.
In most cases, a bee invasion can be safely managed by a professional pest control technician. They have the proper equipment and training to remove the bees without harming them. DIY solutions like spraying insecticides are generally not recommended, as they can be dangerous and ineffective. It's best to call in an expert to properly identify the type of bees, locate the hive, and remove it safely.