Hardware Joy-Con won't connect wirelessly but work perfectly while handheld

[Gammazeth]

Hi, so yesterday my Joy-Cons were working perfectly with my switch and today I did not try to connect them wirelessly until I swapped back to OFW, I tried to connect them but nothing happened, tho they work perfectly while attached to the switch. I switched back to EmuMMC and here again same issue. I tried to unpair all the joy-cons and tried to pair them again, I tried to update them but here again nothing. I tried to connect another pair to my switch and here it worked flawlessly. I tried to connect my pair to a friend's switch and they connected. I don't know where the issue is coming from. Just to mention, the leads aren't working on both joy-cons and on the left the SL and SR button doesn't work tho they work on the right one.

 

[loler55]

try to clean the rails with isopropanol and a
toothbrush looks like a connection issue

 

[Gammazeth]

But how do you explain that my friend's joycons pair correctly?

 

[loler55]

But how do you explain that my friend's joycons pair correctly?

its cleaner and newer

 

[Gammazeth]

Ok I'll try to clean the rails

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I cleaned them, nothing changed

 

[loler55]

try to clean the connector on the joycons aswell

 

[Gammazeth]

Where is it located?

 

[Gammazeth]

OK nothing changed...