Good but some problems of auto switch with some devices

I bought this switch to connect 4 devices to a TV with only 2 HDMI inputs. I use it for 5 months and no fault was reported. However the automatic switch malfunctions with certain devices. In theory the box switches to the last source turned on automatically, and a button to manually switch (the switch will remain on the input selected until another device must on. In practice ...

I have:
- PS3
- A Blu-ray player Sony
- A TNT CGV
- A desktop PC
I originally wanted to connect the decoder itself (as it is on continuously and it is the device that I use most) and the 3 other devices to the switch. But can not use the PC, the box would not stop switch back to the previous selected input (perhaps because the signal from the PC is not stable / permanent?). I also had the same problem with the PS3. Though I manually select PC or PS3 rebasculait the case to another entry, sometimes turning my blu-ray player in the process.
I have since changed my connections. Now that I plug my own PC and I use the box to switch between PS3, blu-ray and TNT, I have no worries. But I could find myself in a bind if I had only one HDMI input, so if that's distrust you.

Final Note: LEDs are dazzling, it's unpleasant night if you sleep in the same room.

In the end I'm happy with my purchase, but I have struggled before getting it to work as I wanted, so I would have preferred a switch 100% manual.