Why my phone didn't get a signal?

Hello everyone,I need your expert opinion on a very confusing issue with my Redmi Note 8 (ginkgo) that I'm certain is a hardware fault, but local technicians have dismissed it as software.The Complete History:1. Early Symptoms: The phone started randomly freezing and rebooting by itself.2. Network Issues Begin: It then started dropping calls. During a call, the network would die, and the Wi-Fi would also stop working.3. The "Physical Percussion" Fix (The Smoking Gun): The problem became worse, with no network or Wi-Fi at all. However, if I physically hit or tap the phone, it would start working perfectly for several hours (sometimes up to a day).4. Current State: Now, the issue is constant but erratic.• Sometimes, I get a "false signal" (signal bars are shown, but I can't make calls or use mobile data).• During this time, the Wi-Fi works fine, but if I check "About Phone", the Baseband version and IMEI are "Unknown".• A simple reboot temporarily fixes everything, but the problem returns shortly after.My Conclusion:

The history, especially the fact that hitting the phone fixed it temporarily, points 100% to a hardware issue – most likely a fractured solder joint under a critical IC. The random reboots at the beginning suggest the problem might have started as a bad connection to the Baseband IC, which has now worsened.My Question for You Experts:• Based on this full history, do you agree this is a classic hardware failure?• Does this sound more like a Baseband IC reballing job or a faulty Power Amplifier (PA)? (I know a faulty PA can sometimes cause a Baseband crash).I'm looking for confirmation before I go to a specialized micro-soldering technician and insist on a motherboard-level repair. Thank you for your time and expertise.