talliar, you say that on April 1 your coins are still in the wallet - so something is happened in the next 2 days with your phone. Try to remember if you downloaded an app during that period, did you notice anything strange on your phone?
For how long you keep your coins in that wallet, do you have 1+BTC for a long time, or you just transfer that amount on April 1?
these days my family and I were cleaning the area around the house (we have something like a farm in the village). these days I almost did not use the phone. mainly telegram and viber for communicating with parents. I can definitely say that I did not install new applications (the latter was installed two weeks ago, this is soundcloud), and I can definitely say that these days I did not go into the electrum and did not perform any operations. On April 1st, I checked in the evening that a friend had returned my debt. I know many cases where hackers replaced links. I know cases when they replaced the address and bitcoins went to the address of hackers. but so far I could not find cases when this happened without any actions of the owner.that is why I want to understand in detail how this happened. Because while I do not understand this, I do not think it is safe for me to reuse this application. I'm sorry for my English, this is not my native language, in part, I use a translator. Here is a screenshot of the latest wallet transactions.
https://i.ibb.co/yWjtqnG/Screenshot-2020-04-06-15-26-40-976-org-electrum-electrum.png