Hey Dude....
Its a problem with me too...at late night times
When packet loss occurs due to high ping or some wire connection problems, we lost some amount of data coming from server and that make us not to see new objects loading.If it keep on occuring we get time out.But sometimes connection get recovered due to good ping and everything comes back.
Maybe you re install samp client...
if it does not works.Try buying new wires for your modem.