I do not know this modem. We tested a lot Huawai E3372s-153 and hilink version is not working with Braodcom based router - and we have the same symptoms you are talking about. It is Broadcom fault and you will see the same issues for all softs even factory, Merlin, OpenWRT etc. In Tomato 131 Shibby added new driver that work very good with non hilink version of Huawai E3372s-153 modem. Maybe if you will change your modem to non hilink it will help in your situation.
We tested that the only router with Broadcom chipset that works OK is ASUS RT-N10U. Alternative is to use TP-LInk router with gargoyle soft.
Orange 300/50 Mb/s + ONT Terminal
HPE MS gen8 Proxmox 7.0-11 VMs: Router OPNsense 23.X-amd64 and OMV
HPE MicroServer gen8: Xeon E3-1265Lv2, 16GB (2x KTH-PL316E/8G), HP 331T, 4x4TB WD RED
Asus RT-AC68U AccessPoint
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