Question about the in-game behavior of the AESA radar

I’m experiencing several perplexing issues and would appreciate it if someone knowledgeable could explain them. When using the E-Gripen, the image of an aircraft displayed on the radar screen frequently disappears suddenly and reappears after several tens of seconds. Furthermore, even when I point the radar at a detected enemy aircraft, it sometimes remains undisplayed for extended periods, and the soft lock on an approaching enemy aircraft suddenly switches to a semi-lock. The radar mode is set to TWS, and the radar direction and elevation/depression angles are properly adjusted. Why is this happening? Does this problem occur with all AESA radars, not just the E-Gripen? I only own an E-Gripen, so I’m unfamiliar with other radars. Thank you for your help.

What direction is the target aircraft flying relative to you?