This is a very popular issue, quite frankly if it’s something that has got worse over time, It’s just hair clogging up the pipework. The best action you can do is get a hair catch and minimalize the amount of hair getting into the drains. I’m not going to tell you to try and give it a plunge yourself, because I have attended quite a lot of jobs over the last few years of people blowing off their traps with plungers nowadays after investigating the state of the trap, it boils down to chemical use, such as acid to try and clear the drains. Professional opinion: Get a Drainage Engineer to inspect your pipework and give you the okay to self-clear blockages moving forward to avoid any dramatic flooding. Depending on what’s found pipework may need to be changed to enable you to be in that situation.