Network trouble with zoom

Hello, I've used zoom videoconferencing without issues for some time on my home AT&T service (Internet 50). Lately, however, I have attended a handful of meetings with a large number of participants where zoom complains of an unstable internet connection or crashes. This happens on two different devices: a desktop PC and a Mac laptop. Smaller meetings still work fine, and no one else in the larger meetings is reporting any problem. Wi-fi strength is reported good on both devices, and speedtest varies, but should always be sufficient (20-50 Mbps). Is it possible something is going wrong between local AT&T network and zoom? (traceroute below) Any other troubleshooting advice would be appreciated.

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Tracing route to zoom.us [52.202.62.236]

over a maximum of 30 hops:

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1 4 ms 4 ms 4 ms homeportal [192.168.1.254]

2 15 ms 7 ms 8 ms 162-227-0-1.lightspeed.frsnca.sbcglobal.net [162.227.0.1]

3 * * * Request timed out.

4 611 ms 56 ms 61 ms 12.123.15.30

5 56 ms 66 ms 49 ms cr1.sl9mo.ip.att.net [12.122.18.9]

6 50 ms 54 ms 54 ms la2ca22crs.ip.att.net [12.122.2.166]

7 2093 ms 54 ms 53 ms dlstx22crs.ip.att.net [12.122.2.81]

8 47 ms 65 ms 47 ms 12.123.18.209

9 47 ms 47 ms 47 ms 12.244.76.10

10 * * * Request timed out.

11 * * * Request timed out.

12 * * * Request timed out.

13 * * * Request timed out.

14 * * * Request timed out.

15 * * * Request timed out.

16 * * * Request timed out.

17 * * * Request timed out.

18 * * * Request timed out.

19 * * * Request timed out.

20 * * * Request timed out.

21 * * * Request timed out.

22 * * * Request timed out.

23 * * * Request timed out.

24 * * * Request timed out.

25 * * * Request timed out.

26 * * * Request timed out.

27 * * * Request timed out.

28 * * * Request timed out.

29 * * * Request timed out.

30 * * * Request timed out.