There are two possibilities or reasons for Slipping of coins.
First, of all let me tell few things about the market movement. I hope you know that markets always move in waves means to tell that they move in swinging ups and downs and here in the Crypto market you can see that Bitcoin and many other coins are rallying from the month of September and till now there has no correction seen and just because of that reason you are seeing this correction a little bit deeper and it's going sideways right now and we can expect to see rally again if it fails to go few more selling days.
Second possibility is that after a long-term uptrend there is a possibility of starting a new downtrend which may run for another one year and if that is seen on the charts then you can see the bitcoin prices reaching again $5000 to $4000 price levels and so be careful while trading downtrend because it very important that you know when the downtrending is starting and when the downtrend is going to end this is the place where most traders fail and they hit their stop losses.