data lost over UDP in matlab

Hi;
I have a problem with using udp command in matlab.
from the sending end i send in data. on the receiving end i received the data with data (packets) lost.
Can any one please guide me where the problem is. ?

the size of my receiving buffer is 8192 Bytes and the data is send continuously.

My transmitter code is:

u1=udp('192.168.1.55', 9091,'LocalPort', 9090);
set(u1, 'OutputBufferSize', 8192)
set(u1, 'TimeOut', 10)
fopen(u1)
get(u1, 'Status')
while(1)
fwrite(u1, ubuffer(1, : ), 'double'); %ubuffer is of size 1x1024
end
fclose(u1)
delete(u1)

My receiver code is:

u=udp('192.168.1.166', 9090, 'LocalPort', 9091, 'InputBufferSize', 8192, 'TimeOut', 10);
fopen(u);
while(1)
[a,count]= fread(u, 1024, 'double');
end
fclose(u)
delete(u)

My problem is that as soon as i increase the number of elements transmitted past 64, i can only receive 64 elements at receiver. Like if i transmit 1x1024 element array, at receiver i get first 64 elements only. Like at this line of code at receiver:

[a,count]= fread(u, 1024, 'double');

i only get 'a' of size 64x1, although i should get 1024x1 size of 'a'. The value of count is also 64, it should be 1024.

To rectify this i have to use a loop and make a 2d array at receiver like 64x16 for 1024 element transmitted array. Also i get a warning "The specified amount of data was not returned in time" after reading every 64 elements. Is there any solution to receive all elements like 1024 in one go??? like i dont have to use loop just
[a,count]= fread(u, 1024, 'double');
and i get all the transmitted elements.

My second problem is that i cannot transmit complex numbers using UDP. I transmit 3 complex numbers and at receiver i only get real part of these complex numbers. Any ideas????