ERR_CONNECTION_TIMED_OUT in LTE5398-M904


Hello,
I have a problem with my LTE5398-M904 for 5 days with SIM Orange and good external antenna. I had no problems with it for several months previously. 50% of page opened/refreshed take a long time and finally end with: ERR_CONNECTION_TIMED_OUT or broken site. I have to refresh the page many times to open it in all devices (more than 10 - windows pc, android phones, android tv, linux pc) in network. Devices are connected to router directly via UTP, via switch or wirelessly. I haven't changed anything in the router configuration for a long time.
I tried:
- Manual band select
- Factory default
- Unplugging the router from the power supply for a long time
- Connect only one device to router
- Upgrade to V1.00(ABQV.5)C0 - currently i have V1.00(ABQV.4)C0, because on V.5 the router had the same problem and additionally from time to time it completely lost the internet
- Changing DNS in router
- Long ping-tests (1000 packets, 32 bytes, avg_time=22ms, 0% loss)
- Contact with internet provider
Nothing helps.
Cellular parameters:
SpeedTest: 90Mbps Down / 25Mbps Up / 25ms ping
My mobile phone is also in Orange and LTE connects to the same BTS and works perfectly. Laptop via phone hotspot works great.
Any idea how to find a solution?
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