rtc/transport.go:* error reading data channel

### Steps to reproduce

1. Create room
2. Join
3. Wait time

### Outcome

`2026-03-26T03:31:46.524Z WARN livekit.transport rtc/transport.go:919 error reading data channel {"room": "b/mQ+L0Mni7alXFLVPbuBFlua64oEYKH12QYRM0UTsU", "roomID": "RM_9MXQ9hCjCrEN", "participant": "@testcall5:matrix.orenpay.ru:QOVUAEHTCE", "pID": "PA_ZBgzPgPkqYRx", "remote": false, "transport": "PUBLISHER", "label": "_reliable", "error": "dtls timeout: read/write timeout: context deadline exceeded"}
2026-03-26T03:31:46.524Z WARN livekit.transport rtc/transport.go:919 error reading data channel {"room": "b/mQ+L0Mni7alXFLVPbuBFlua64oEYKH12QYRM0UTsU", "roomID": "RM_9MXQ9hCjCrEN", "participant": "@testcall5:matrix.orenpay.ru:QOVUAEHTCE", "pID": "PA_ZBgzPgPkqYRx", "remote": false, "transport": "PUBLISHER", "label": "_lossy", "error": "dtls timeout: read/write timeout: context deadline exceeded"}
2026-03-26T03:31:46.527Z WARN livekit.transport rtc/transport.go:1276 error reading data channel {"room": "b/mQ+L0Mni7alXFLVPbuBFlua64oEYKH12QYRM0UTsU", "roomID": "RM_9MXQ9hCjCrEN", "participant": "@testcall5:matrix.orenpay.ru:QOVUAEHTCE", "pID": "PA_ZBgzPgPkqYRx", "remote": false, "transport": "SUBSCRIBER", "label": "_lossy", "error": "[0xc002fd0008] abort chunk, with following errors: (User Initiated Abort: Close called)"}
2026-03-26T03:31:46.527Z WARN livekit.transport rtc/transport.go:1276 error reading data channel {"room": "b/mQ+L0Mni7alXFLVPbuBFlua64oEYKH12QYRM0UTsU", "roomID": "RM_9MXQ9hCjCrEN", "participant": "@testcall5:matrix.orenpay.ru:QOVUAEHTCE", "pID": "PA_ZBgzPgPkqYRx", "remote": false, "transport": "SUBSCRIBER", "label": "_reliable", "error": "[0xc002fd0008] abort chunk, with following errors: (User Initiated Abort: Close called)"}
`
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**After that, the person is kicked out of the room with an error /Connection lost
You have been disconnected from the call./

The ports are open
I also tested the functionality using the LiveKit online test**
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### Operating system

Ubuntu

### Browser information

Browser Google Chrome and Element desktop

### URL for webapp

v0.18.0-29-g385ab0a0

### Will you send logs?

No

Start by reproducing the disconnect and inspect rtc/transport.go at the logged lines 919 and 1276, focusing on the data-channel read errors. Compare the DTLS timeout and user-initiated abort with the room disconnection, then verify that the underlying failure is identified and the connection no longer drops unexpectedly.

Written by the indexing model from the issue text.