d858hk sim issue - G3 Q&A, Help & Troubleshooting

I own a d858hk dual sim lg g3. Lately I am having problem with the sims. IF I insert sim cards in both sim 1 and 2 slots, none of the sims work and only 4g network gets connected on sim 1 sometimes. 2k and 3g on sim 1 and 2g on sim 2 doesn't work. If I put sim in only slot 1, only 4g network gets connected on sim 1 sometimes. 2k and 3g on sim 1 don't work. If I put the sim only in sim slot 2 then I get 2g working on sim 2. In short I only get the sim to work when inserted in only sim slot 2. If 2 sims inserted in both slot neither of the sims work. It is not a software issue. I have tried flashing the kdz, the tot file. tried kitkat, lollipop and marshmallow kdz with same results. I have even tried custom roms and the result was same. I only get network connection when sim is inserted in slot 2 only. It is apparently some hardware issue.. If anyone has insight on what the problem can be, please help me. Anxiously waiting for your reply

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