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My RUT240 has an annoying habit of dropping the 4G connection whenever I do an Ookla speedtest.  I'm assuming it has problems with the high data throughput, but it rarely measures above about 40 Mb/s, which should be well within its capability.

Anybody else seen this, or can offer a solution?  It is a moderate to strong signal of high quality (RSRP ~ -90 dBm, RSRQ ~ -7 dB, SINR ~ 20 dB), so that is not the issue.

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Hello,

generate the troubleshoot file and send it to me via private message.
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Confirmed with Teltonika tech support that the 4G/LTE port drops the connection when it encounters sustained speeds above about 40 Mb/s, despite it being a strong and stable signal.  The WAN port is fine right up to 100 Mb/s.  Unfortunately there is no solution offered, so we don't know if it is a fault with this specific router, or a more general design flaw for the RUT240.

Anybody else seen a similar effect?
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Do you have any other RUT240 ? I'm not aware of any similar issues, thus I assume that your particular unit might be affected.
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That’s my assumption as well. Teltonika show no interest in swapping it out to test, so I will take it up directly with the seller.
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Could you PM your Reseller ? I'll arrange so that your unit would reach the developers for analysis.
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Thank you for your reply.  I have already messaged the seller through Amazon UK, so will add your comment.
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I can confirm the same problem with Speedtest. Sustained speeds between 25-50 Mbit/s very reliably cause modem freeze. The freeze can be fixed with modem restart or manual "gsmctl -d" in shell. My friend with RUT240 also has the same problem, we have different HW batches too.
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Hello, have you already filled the RMA form ? or maybe it would be possible to arrange a remote session to your device and troubleshoot it in real time ? Please PM me if it would be possible from your side.