RBLHGG-5acD to RBSXTG-5HPacD-SAr2 big problems!

Hi,

today i have received a RBLHGG-5acD (LHG5 XL AC) with big problems to connect over NV and channel 5160 or 5200 (only-n). I became (key exchange timeout) after 10-20 seconds. My (LHG5 XL) run without problems. What can be the problem with (QCA9557) and (IPQ-4018) i’am very disappointed. all other devices run 100%. It’s to new chipset or is this only tested with wpa and not nv2? Are
the frequency spectrum the same to AR9344 (RBLHG-5HPnD-XL)?

So are the problems with the new LHG 5 ac. At 5280, it works poorly. At frequencies above 5500 it works well. In NV2, packet loss. At 40MHz, the rain drops the link.
Stably works at a frequency above 5500 in 20/40 MHz, in dry weather, pumping 100-110 Mbit / s is the maximum.