WLAN bandwidth frequently drops to <30mbps permanently. Streaming Blu-ray from NAS isn't feasible anymore then. Bandwidth is still enough for streaming services like Netflix though.
When bandwidth drops, WLAN signal strength is still shown as Excellent (-43 dBm) and link speed as 866mbps. Other devices connected to the same access point (FRITZ!WLAN Repeater 1750E configured as LAN bridge) still operate at full bandwidth. After disabling and re-enabling WLAN on BRAVIA, "full" bandwidth (~250mbps on BRAVIA) is available again.
Bandwidth has been measured via fast.com using Vewd internet browser on BRAVIA and via iPerf (analiti on BRAVIA, iPerf3 on QNAP NAS):
I switched off my 5GHz WiFi in order to verify via spectrum analyzer that there is no interference on the used 80MHz channel 42 (5170-5250MHz):
What is quite interesting is that when bandwidth drops to <30mbps, only the first 20MHz of the 80MHz wide channel are extensively being used:
One can clearly see that there is not a lot of activity on the remainder of the 80MHz wide channel.
The problem seems to be much more severe after power-cycling the router/WiFi access point. Bandwidth drops to <30mbps on a daily basis (typically after every deep sleep standby). There seems to be a settling process which takes some days after which connection becomes more reliable. Same is true for #53. All other devices on the WiFi instantly connect and make use of the full channel bandwidth at any time.
WLAN bandwidth frequently drops to <30mbps permanently. Streaming Blu-ray from NAS isn't feasible anymore then. Bandwidth is still enough for streaming services like Netflix though.
When bandwidth drops, WLAN signal strength is still shown as Excellent (-43 dBm) and link speed as 866mbps. Other devices connected to the same access point (FRITZ!WLAN Repeater 1750E configured as LAN bridge) still operate at full bandwidth. After disabling and re-enabling WLAN on BRAVIA, "full" bandwidth (~250mbps on BRAVIA) is available again.
Bandwidth has been measured via fast.com using Vewd internet browser on BRAVIA and via iPerf (analiti on BRAVIA, iPerf3 on QNAP NAS):
I switched off my 5GHz WiFi in order to verify via spectrum analyzer that there is no interference on the used 80MHz channel 42 (5170-5250MHz):
What is quite interesting is that when bandwidth drops to <30mbps, only the first 20MHz of the 80MHz wide channel are extensively being used:
One can clearly see that there is not a lot of activity on the remainder of the 80MHz wide channel.
The problem seems to be much more severe after power-cycling the router/WiFi access point. Bandwidth drops to <30mbps on a daily basis (typically after every deep sleep standby). There seems to be a settling process which takes some days after which connection becomes more reliable. Same is true for #53. All other devices on the WiFi instantly connect and make use of the full channel bandwidth at any time.