very poor decoding of wsjt-x from my remote PC and radio

I have been running a remote 6400 for the past 6 years with great results. I usualy use a maestro or Mac/PC to access my remote station. For the WSJT modes I like the smart SDR for MAC OS which is very limited but works very well. there is no contest or F/H modes available. For this type of use, I run WSJT, slice master, and smart SDR for windows at the remote PC at my remote station 150 mi away from home QTH. for the past 10 months the decoding of FT8, FT4 signals has become very poor with decodes maybe every 15-20 receive cycles. The Tx appears to work fine. For the MS modes, the decodes have become NONE. My internet service is 120 down, 42 up, at my remote site it is 84 down, 8 up with 14ms latency. With wsjt running at the remote PC, when I fro example push the tune button, it takes between 4-7 seconds befor I see any RF our of the Tx. This delay has to be my problem. With only smart SDR running at the remote PC, if I hit the tune button, I will see RF output in a fraction of a second. I have tried to configure a version of WSJT-x without using slice master, and the results are identical. The same is also true for JTDX.

Any idea of what my problem may be, it has only recently started. I have no control of the internet service at my remote site, but everything else works perfect. I am primarily a CW operator, and either the Maestro or my Winkeyer interface to smart SDR works fine.

Howard AE3T