Lenovo P780 suddenly rarely has signal

Hi! First of all, I read a lot of threads in this forum and no, those didn't help me.
I bought a Lenovo P780 in February, ROW version (if I remember ROW123 4GB), imei starts with 860. I installed a custom rom (I checked and it is for this ROW) and it worked fine. One day in May I noticed that I got no signal. Then it came back. Than it went away. It is still the problem of course.
I never dropped nor flooded the phone. I tried installing other GSM modems as people on forums suggested, I tried a lot but none of them worked. I was angry so I took it apart, and saw that the outer shell of the antenna cable was damaged, so I ordered a new one, but it didn't help. I checked the whole PCB under a magnifying glass so maybe I would find any sign of damage so then I can replace the faulty component (I have access to do that), but I found nothing.
I tried it with different SIM cards. Then I found out, that in the Settings menu in the about phone section you can see the exact signal strength (it usually says 0dBm 99 asu which is absurd). You can only access it when you have a SIM card in the device but when you are in, you can take it out and you can still see the signal strength. It sometimes finds signal, but it is very rare. 
What should I do? I have no money to replace the motherboard, and of course I have no warranty. Is there a chance that my problem is software-based, or it is surely hardware stuff? What can I do? 

I have the same problem. Have you found any solutions?
Both sims had full signal (cosmote and vodafone) and everything worked fine.
Suddenly one day none had signal. If I only leave one sim in the phone sometimes it has full signal, but most of the time low or no signal.
ANything would help. Thank you.

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