Antenna for Z390 Wi-Fi connection
Antenna for Z390 Wi-Fi connection
That's because you're using WiFi, which can be affected by interference. Just because there were no problems at first doesn't mean things won't change. I'm in agreement with @Slottr; a new antenna probably won't help much. A new one might just make you more sensitive to getting the signal. However, overall WiFi tends to have higher latency. I'd recommend considering power line adapters or MOCA adapters instead.
I also use a MOCA adapter, and this cable is working properly with my PC.