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A possible solution to reduce the frequency of the TX DMA errors is as follows:
Log in via SSH/telnet,
Copy and paste the following line

uci set wireless.radio0.diversity=1 && uci set wireless.radio0.rxantenna=0x7 && uci set wireless.radio0.txantenna=0x7 && uci set wireless.radio0.disassoc_low_ack=0 && uci commit wireless && wifi

The command forces diversity and makes txantenna 0x3 and rxantenna 0x7

You should see this when you cat the /etc/config/wireless file

    ..............................
    option diversity 1
    option rxantenna 0x7
    option txantenna 0x7
    option disassoc_low_ack 0
    ..............................