Eufy Indoor 2k cam connection lost after few seconds


I have an indoor cam 2k. The cam is installed very close to the router (about 5 meters, no walls). I receive notifications when movement is detected by the cam quite well.

The problem is when I try to connect to the cam to watch the recorded events or the live feed. Almost always the connection takes a lot of time (10-30 seconds), about half of the times the connection never happens and when it does I can only watch 1-5 seconds until the connection is lost.

Any ideas where the problem could be?