I think the reason for this drop (chf weakness against strong yen) is because of the strength of Gold. This reasoning is more relevant to CHFJPY rather than USDJPY is that while the Frank may be a safe haven currency, it does not correlate with Gold price.
There are other reasons, such as the overall bearish frank this week and Frank price action broke below 100 EMA, I would like to point out that for the upcoming week price has just recently broke underneath the 200 EMA.
In addition, Gold looks bullish both fundamentally and technically as of my 2/8/20 Gold Analysis. This means the Yen may continue to gain strength against the Frank.
The conclusion is for the next trading week my bias for CHFJPY is BEARISH
https://www.tradingview.com/x/W2bCD8Vn/