Olá, amigo vi aqui duas configurações que podem está dando problema.
Primeiro erro: os DNS podem está dando instabilidade na internet por não ser os propios DNS das operadoras
/ip dns set primary-dns=8.8.8.8
/ip dns set secondary-dns=8.8.4.4
Aqui eu uso os proprios DNS das operadoras dos links
Segundo erro: per-connection-classifier
per-connection-classifier=both-addresses-and-ports:6/0
per-connection-classifier=both-addresses-and-ports:6/1
per-connection-classifier=both-addresses-and-ports:6/2
per-connection-classifier=both-addresses-and-ports:6/3
per-connection-classifier=both-addresses-and-ports:6/4
per-connection-classifier=both-addresses-and-ports:6/5
Aqui os meus per-connection-classifier vai do 14/0 até 14/12 e eu uso 4 links igual você
per-connection-classifier=both-addresses-and-ports:14/0
per-connection-classifier=both-addresses-and-ports:14/1
per-connection-classifier=both-addresses-and-ports:14/2
per-connection-classifier=both-addresses-and-ports:14/3
per-connection-classifier=both-addresses-and-ports:14/4
per-connection-classifier=both-addresses-and-ports:14/5
per-connection-classifier=both-addresses-and-ports:14/6
per-connection-classifier=both-addresses-and-ports:14/7
per-connection-classifier=both-addresses-and-ports:14/8
per-connection-classifier=both-addresses-and-ports:14/9
per-connection-classifier=both-addresses-and-ports:14/10
per-connection-classifier=both-addresses-and-ports:14/11
per-connection-classifier=both-addresses-and-ports:14/12
Faz essas modificações e ver se resolve ai e posta os resultados para galera que de repente tiver um problema parecido já vão saber como resolver e se puder aperta em estrelinha ai valeu.