When something is wrong with the water at home and you cannot work out what, you can call a plumber to your door. The plumbing work is done on call-out, so the plumber comes to wherever the problem is. Call and briefly describe what happened.
Before calling, find the spot where water shows up or disappears and photograph it together with the nearby pipe or fixture. If it is leaking, close the nearest shut-off valve and put a rag or basin underneath.
If it is not too much trouble, tell the plumber you found them on madloba.info.
✍️ If you have already used this plumber, leave a review on madloba.info: did they help, and how did the communication go? Your experience will help others choose.